diff --git a/doc/api.oa3 b/doc/api.oa3
index 4ff0141b..baa3a377 100644
--- a/doc/api.oa3
+++ b/doc/api.oa3
@@ -2439,15 +2439,7 @@ paths:
         content:
           application/json:
             schema:
-              type: object
-              required:
-                - type
-                - data
-              properties:
-                type:
-                  type: string
-                data:
-                  type: string
+              $ref: '#/components/schemas/Subject'
           
   /content/labels/{labelId}:
     put:
@@ -2477,15 +2469,7 @@ paths:
         content:
           application/json:
             schema:
-              type: object
-              required:
-                - type
-                - data
-              properties:
-                type:
-                  type: string
-                data:
-                  type: string
+              $ref: '#/components/schemas/Subject'
     delete:
       tags:
         - content
@@ -4405,17 +4389,24 @@ components:
       type: object
       required:
         - labelId
-        - labelRevision
-        - type
-        - data
-        - created
-        - modified
+        - revision
+        - labelData
       properties:
         labelId:
           type: string
-        labelRevision:
-          type: integer
-          format: int64
+        revision:
+          type: string
+        labelData:
+          $ref: '#/components/schemas/LabelData'
+          
+    LabelData:
+      type: object
+      required:
+        - type
+        - data
+        - created
+        - updated
+      properties:
         type:
           type: string
         data:
@@ -4423,6 +4414,9 @@ components:
         created:
           type: integer
           format: int64
+        updated:
+          type: integer
+          format: int64
         groups:  # present only in account holder responses
           type: array
           items:
diff --git a/net/server/internal/api_addLabel.go b/net/server/internal/api_addLabel.go
new file mode 100644
index 00000000..7d1af9c1
--- /dev/null
+++ b/net/server/internal/api_addLabel.go
@@ -0,0 +1,71 @@
+package databag
+
+import (
+  "net/http"
+  "errors"
+  "gorm.io/gorm"
+  "github.com/google/uuid"
+  "databag/internal/store"
+)
+
+func AddLabel(w http.ResponseWriter, r *http.Request) {
+
+  account, code, err := BearerAppToken(r, false)
+  if err != nil {
+    ErrResponse(w, code, err)
+    return
+  }
+
+  var subject Subject
+  if err := ParseRequest(r, w, &subject); err != nil {
+    ErrResponse(w, http.StatusBadRequest, err)
+    return
+  }
+
+  slot := &store.LabelSlot{}
+  label := &store.Label{}
+  err = store.DB.Transaction(func(tx *gorm.DB) error {
+
+    data := &store.LabelData{
+      Data: subject.Data,
+    }
+    if res := tx.Save(data).Error; res != nil {
+      return res
+    }
+
+    label.LabelDataID = data.ID
+    label.LabelData = *data
+    label.DataType = subject.DataType
+    if res := tx.Save(label).Error; res != nil {
+      return res
+    }
+
+    if res := tx.Where("account_id = ? AND label_id = 0", account.ID).First(slot).Error; res != nil {
+      if errors.Is(res, gorm.ErrRecordNotFound) {
+        slot.LabelSlotId = uuid.New().String()
+        slot.AccountID = account.ID
+      } else {
+        return res
+      }
+    }
+    slot.LabelID = label.ID
+    slot.Revision = account.LabelRevision + 1
+    slot.Label = label
+    if res := tx.Save(slot).Error; res != nil {
+      return res
+    }
+    if res := tx.Model(&account).Update("label_revision", account.LabelRevision + 1).Error; res != nil {
+      return res
+    }
+    return nil
+  })
+  if err != nil {
+    ErrResponse(w, http.StatusInternalServerError, err)
+    return
+  }
+
+  SetStatus(account)
+  WriteResponse(w, getLabelModel(slot, true, true))
+}
+
+
diff --git a/net/server/internal/api_content.go b/net/server/internal/api_content.go
index a68015f6..21caf9cc 100644
--- a/net/server/internal/api_content.go
+++ b/net/server/internal/api_content.go
@@ -23,11 +23,6 @@ func AddArticleTag(w http.ResponseWriter, r *http.Request) {
 	w.WriteHeader(http.StatusOK)
 }
 
-func AddLabel(w http.ResponseWriter, r *http.Request) {
-	w.Header().Set("Content-Type", "application/json; charset=UTF-8")
-	w.WriteHeader(http.StatusOK)
-}
-
 func ClearArticleGroup(w http.ResponseWriter, r *http.Request) {
 	w.Header().Set("Content-Type", "application/json; charset=UTF-8")
 	w.WriteHeader(http.StatusOK)
@@ -123,21 +118,11 @@ func SetArticleGroup(w http.ResponseWriter, r *http.Request) {
 	w.WriteHeader(http.StatusOK)
 }
 
-func SetArticleLabel(w http.ResponseWriter, r *http.Request) {
-	w.Header().Set("Content-Type", "application/json; charset=UTF-8")
-	w.WriteHeader(http.StatusOK)
-}
-
 func SetArticleSubject(w http.ResponseWriter, r *http.Request) {
 	w.Header().Set("Content-Type", "application/json; charset=UTF-8")
 	w.WriteHeader(http.StatusOK)
 }
 
-func SetLabelGroup(w http.ResponseWriter, r *http.Request) {
-	w.Header().Set("Content-Type", "application/json; charset=UTF-8")
-	w.WriteHeader(http.StatusOK)
-}
-
 func UpdateLabel(w http.ResponseWriter, r *http.Request) {
 	w.Header().Set("Content-Type", "application/json; charset=UTF-8")
 	w.WriteHeader(http.StatusOK)
diff --git a/net/server/internal/api_getArticles.go b/net/server/internal/api_getArticles.go
index 9b04ad10..e902e7d7 100644
--- a/net/server/internal/api_getArticles.go
+++ b/net/server/internal/api_getArticles.go
@@ -113,11 +113,11 @@ func isShared(slot *store.ArticleSlot, guid string) bool {
 }
 
 func getAccountArticles(account *store.Account, revision int64, articles *[]store.ArticleSlot) error {
-  return store.DB.Preload("Article.Groups.GroupSlot").Preload("Article.Labels.Groups.GroupSlot").Where("account_id = ? AND revision > ?", account.ID, revision).Find(articles).Error
+  return store.DB.Preload("Article.Labels.LabelSlot").Preload("Article.Groups.GroupSlot").Preload("Article.Labels.Groups.GroupSlot").Where("account_id = ? AND revision > ?", account.ID, revision).Find(articles).Error
 }
 
 func getContactArticles(card *store.Card, revision int64, articles *[]store.ArticleSlot) error {
-  return store.DB.Preload("Article.Groups.Cards").Preload("Article.Labels.Groups.Cards").Where("account_id = ? AND revision > ?", card.Account.ID, revision).Find(articles).Error
+  return store.DB.Preload("Article.Labels.LabelSlot").Preload("Article.Groups.Cards").Preload("Article.Labels.Groups.Cards").Where("account_id = ? AND revision > ?", card.Account.ID, revision).Find(articles).Error
 }
 
 
diff --git a/net/server/internal/api_removeArticle.go b/net/server/internal/api_removeArticle.go
index 526f5c22..b2198b04 100644
--- a/net/server/internal/api_removeArticle.go
+++ b/net/server/internal/api_removeArticle.go
@@ -27,6 +27,12 @@ func RemoveArticle(w http.ResponseWriter, r *http.Request) {
     if slot.Article == nil {
       return nil
     }
+    if res := tx.Model(slot.Article).Association("Groups").Clear(); res != nil {
+      return res
+    }
+    if res := tx.Model(slot.Article).Association("Labels").Clear(); res != nil {
+      return res
+    }
     if res := tx.Delete(slot.Article).Error; res != nil {
       return res
     }
diff --git a/net/server/internal/api_setArticleLabel.go b/net/server/internal/api_setArticleLabel.go
new file mode 100644
index 00000000..382d8ee5
--- /dev/null
+++ b/net/server/internal/api_setArticleLabel.go
@@ -0,0 +1,76 @@
+package databag
+
+import (
+  "errors"
+  "net/http"
+  "gorm.io/gorm"
+  "github.com/gorilla/mux"
+  "databag/internal/store"
+)
+
+func SetArticleLabel(w http.ResponseWriter, r *http.Request) {
+
+  account, code, err := BearerAppToken(r, false);
+  if err != nil {
+    ErrResponse(w, code, err)
+    return
+  }
+
+  // scan parameters
+  params := mux.Vars(r)
+  articleId := params["articleId"]
+  labelId := params["labelId"]
+
+  labelSlot := &store.LabelSlot{}
+  if err := store.DB.Preload("Label.LabelSlot").Where("account_id = ? AND label_slot_id = ?", account.ID, labelId).First(&labelSlot).Error; err != nil {
+    if !errors.Is(err, gorm.ErrRecordNotFound) {
+      ErrResponse(w, http.StatusInternalServerError, err)
+    } else {
+      ErrResponse(w, http.StatusNotFound, err)
+    }
+    return
+  }
+  if labelSlot.Label == nil {
+    ErrResponse(w, http.StatusNotFound, errors.New("referenced empty label slot"))
+    return
+  }
+
+  articleSlot := &store.ArticleSlot{}
+  if err := store.DB.Preload("Article.Labels.LabelSlot").Preload("Article.Groups.GroupSlot").Where("account_id = ? AND article_slot_id = ?", account.ID, articleId).First(&articleSlot).Error; err != nil {
+    if !errors.Is(err, gorm.ErrRecordNotFound) {
+      ErrResponse(w, http.StatusInternalServerError, err)
+    } else {
+      ErrResponse(w, http.StatusNotFound, err)
+    }
+    return
+  }
+  if articleSlot.Article == nil {
+    ErrResponse(w, http.StatusNotFound, errors.New("referenced empty article slot"))
+    return
+  }
+
+  err = store.DB.Transaction(func(tx *gorm.DB) error {
+
+    if res := tx.Model(articleSlot.Article).Association("Labels").Append(labelSlot.Label); res != nil {
+      return res
+    }
+
+    if res := tx.Model(articleSlot).Update("revision", account.ContentRevision + 1).Error; res != nil {
+      return res
+    }
+
+    if res := tx.Model(account).Update("content_revision", account.ContentRevision + 1).Error; res != nil {
+      return res
+    }
+
+    return nil
+  })
+  if err != nil {
+    ErrResponse(w, http.StatusInternalServerError, err)
+    return
+  }
+
+  SetContentNotification(account)
+  SetStatus(account)
+  WriteResponse(w, getArticleModel(articleSlot, false, true))
+}
diff --git a/net/server/internal/api_setLabelGroup.go b/net/server/internal/api_setLabelGroup.go
new file mode 100644
index 00000000..33f00e49
--- /dev/null
+++ b/net/server/internal/api_setLabelGroup.go
@@ -0,0 +1,82 @@
+package databag
+
+import (
+  "errors"
+  "net/http"
+  "gorm.io/gorm"
+  "github.com/gorilla/mux"
+  "databag/internal/store"
+)
+
+func SetLabelGroup(w http.ResponseWriter, r *http.Request) {
+
+  account, code, err := BearerAppToken(r, false);
+  if err != nil {
+    ErrResponse(w, code, err)
+    return
+  }
+
+  // scan parameters
+  params := mux.Vars(r)
+  groupId := params["groupId"]
+  labelId := params["labelId"]
+
+  labelSlot := &store.LabelSlot{}
+  if err := store.DB.Preload("Label").Where("account_id = ? AND label_slot_id = ?", account.ID, labelId).First(&labelSlot).Error; err != nil {
+    if !errors.Is(err, gorm.ErrRecordNotFound) {
+      ErrResponse(w, http.StatusInternalServerError, err)
+    } else {
+      ErrResponse(w, http.StatusNotFound, err)
+    }
+    return
+  }
+  if labelSlot.Label == nil {
+    ErrResponse(w, http.StatusNotFound, errors.New("referenced empty label slot"))
+    return
+  }
+
+  groupSlot := &store.GroupSlot{}
+  if err := store.DB.Preload("Group.GroupSlot").Where("account_id = ? AND group_slot_id = ?", account.ID, groupId).First(&groupSlot).Error; err != nil {
+    if !errors.Is(err, gorm.ErrRecordNotFound) {
+      ErrResponse(w, http.StatusInternalServerError, err)
+    } else {
+      ErrResponse(w, http.StatusNotFound, err)
+    }
+    return
+  }
+  if groupSlot.Group == nil {
+    ErrResponse(w, http.StatusNotFound, errors.New("referenced empty group slot"))
+    return
+  }
+
+  err = store.DB.Transaction(func(tx *gorm.DB) error {
+
+    if res := tx.Model(labelSlot.Label).Association("Groups").Append(groupSlot.Group); res != nil {
+      return res
+    }
+
+    if res := tx.Model(labelSlot).Update("revision", account.LabelRevision + 1).Error; res != nil {
+      return res
+    }
+
+    if res := tx.Model(account).Update("label_revision", account.LabelRevision + 1).Error; res != nil {
+      return res
+    }
+
+    if res := tx.Model(account).Update("view_revision", account.ViewRevision + 1).Error; res != nil {
+      return res
+    }
+
+    return nil
+  })
+  if err != nil {
+    ErrResponse(w, http.StatusInternalServerError, err)
+    return
+  }
+
+  SetViewNotification(account)
+  SetLabelNotification(account)
+  SetStatus(account)
+  WriteResponse(w, getLabelModel(labelSlot, true, true))
+}
+
diff --git a/net/server/internal/modelUtil.go b/net/server/internal/modelUtil.go
index 2e53e008..d7d5bc34 100644
--- a/net/server/internal/modelUtil.go
+++ b/net/server/internal/modelUtil.go
@@ -9,6 +9,7 @@ func getCardModel(slot *store.CardSlot) *Card {
   if slot.Card == nil {
     return &Card{
       CardId: slot.CardSlotId,
+      Revision: slot.Revision,
     }
   }
 
@@ -61,6 +62,7 @@ func getGroupModel(slot *store.GroupSlot) *Group {
   if slot.Group == nil {
     return &Group{
       GroupId: slot.GroupSlotId,
+      Revision: slot.Revision,
     }
   }
 
@@ -76,6 +78,36 @@ func getGroupModel(slot *store.GroupSlot) *Group {
   }
 }
 
+func getLabelModel(slot *store.LabelSlot, includeData bool, includeGroups bool) *Label {
+
+  if !includeData || slot.Label == nil {
+    return &Label{
+      LabelId: slot.LabelSlotId,
+      Revision: slot.Revision,
+    }
+  }
+
+  var groups *[]string
+  if includeGroups {
+    groups = &[]string{}
+    for _, group := range slot.Label.Groups {
+      *groups = append(*groups, group.GroupSlot.GroupSlotId)
+    }
+  }
+
+  return &Label{
+    LabelId: slot.LabelSlotId,
+    Revision: slot.Revision,
+    LabelData: &LabelData{
+      DataType: slot.Label.DataType,
+      Data: slot.Label.LabelData.Data,
+      Created: slot.Label.Created,
+      Updated: slot.Label.Updated,
+      Groups: groups,
+    },
+  }
+}
+
 func getArticleModel(slot *store.ArticleSlot, contact bool, shared bool) *Article {
 
   if !shared || slot.Article == nil {
@@ -85,14 +117,14 @@ func getArticleModel(slot *store.ArticleSlot, contact bool, shared bool) *Articl
     }
   }
 
-  var groups []string;
+  var groups []string
   if !contact {
     for _, group := range slot.Article.Groups {
       groups = append(groups, group.GroupSlot.GroupSlotId)
     }
   }
 
-  var labels []string;
+  var labels []string
   for _, label := range slot.Article.Labels {
     labels = append(labels, label.LabelSlot.LabelSlotId)
   }
diff --git a/net/server/internal/models.go b/net/server/internal/models.go
index 581e18c4..29f48cb2 100644
--- a/net/server/internal/models.go
+++ b/net/server/internal/models.go
@@ -174,7 +174,7 @@ type LabelData struct {
 	Data string `json:"data"`
 	Created int64 `json:"created"`
 	Updated int64 `json:"updated"`
-	Groups []string `json:"groups,omitempty"`
+	Groups *[]string `json:"groups,omitempty"`
 }
 
 type NodeConfig struct {
diff --git a/net/server/internal/store/schema.go b/net/server/internal/store/schema.go
index f0083799..3904ed23 100644
--- a/net/server/internal/store/schema.go
+++ b/net/server/internal/store/schema.go
@@ -230,6 +230,7 @@ type Article struct {
   TagRevision       int64           `gorm:"not null"`
   Groups            []Group         `gorm:"many2many:article_groups;"`
   Labels            []Label         `gorm:"many2many:article_labels;"`
+  ArticleSlot       ArticleSlot
 }
 
 type ArticleAsset struct {
diff --git a/net/server/internal/ucAddArticle_test.go b/net/server/internal/ucAddArticle_test.go
index 83dfafb7..a2b70bd6 100644
--- a/net/server/internal/ucAddArticle_test.go
+++ b/net/server/internal/ucAddArticle_test.go
@@ -11,10 +11,16 @@ func TestAddArticle(t *testing.T) {
   var err error
   var rev *Revision
   var ver *Revision
-  var article Article
+  var article *Article
   var articles *[]Article
   var articleAccess *ArticleAccess
   var cards []Card
+  var label *Label
+  var subject *Subject
+  var vars *map[string]string
+  var contentRevision int64
+  var viewRevision int64
+  var labelRevision int64
 
   // setup testing group
   set, err = AddTestGroup("addarticle")
@@ -25,9 +31,11 @@ func TestAddArticle(t *testing.T) {
 
   // create article
   articleAccess = &ArticleAccess{ Groups: []string{set.A.B.GroupId} }
-  assert.NoError(t, SendEndpointTest(AddArticle, "POST", "/content/articles", nil, articleAccess, APP_TOKENAPP, set.A.Token, &article))
+  article = &Article{}
+  assert.NoError(t, SendEndpointTest(AddArticle, "POST", "/content/articles", nil, articleAccess, APP_TOKENAPP, set.A.Token, article))
 
-  assert.NoError(t, SendEndpointTest(AddArticle, "POST", "/content/articles", nil, articleAccess, APP_TOKENAPP, set.A.Token, &article))
+  article = &Article{}
+  assert.NoError(t, SendEndpointTest(AddArticle, "POST", "/content/articles", nil, articleAccess, APP_TOKENAPP, set.A.Token, article))
 
   assert.NoError(t, SendEndpointTest(RemoveArticle, "DELETE", "/content/articls/" + article.ArticleId, &map[string]string{"articleId": article.ArticleId }, nil, APP_TOKENAPP, set.A.Token, nil))
 
@@ -67,4 +75,70 @@ func TestAddArticle(t *testing.T) {
   assert.NoError(t, SendEndpointTest(GetArticles, "GET", "/content/articles?contentRevision=0&viewRevision=" + strconv.FormatInt(cards[0].CardData.NotifiedView, 10), nil, nil, APP_TOKENCONTACT, set.B.A.Token, articles))
   assert.Equal(t, 2, len(*articles))
 
+  ver = GetTestRevision(set.C.Revisions)
+
+  // add another article
+  article = &Article{}
+  articleAccess = &ArticleAccess{}
+  assert.NoError(t, SendEndpointTest(AddArticle, "POST", "/content/articles", nil, articleAccess, APP_TOKENAPP, set.A.Token, article))
+
+  // capture updated card on new article
+  rev = GetTestRevision(set.C.Revisions)
+  assert.NoError(t, SendEndpointTest(GetCards, "GET", "/contact/cards?cardRevision=" + strconv.FormatInt(ver.Card, 10), nil, nil, APP_TOKENAPP, set.C.Token, &cards))
+  assert.Equal(t, 1, len(cards))
+  viewRevision = cards[0].CardData.NotifiedView
+  contentRevision = cards[0].CardData.NotifiedContent
+  labelRevision = cards[0].CardData.NotifiedLabel
+  ver = rev
+
+  // create new label
+  label = &Label{}
+  subject = &Subject{ DataType: "labeltype", Data: "labeldata" }
+  assert.NoError(t, SendEndpointTest(AddLabel, "POST", "/content/labels", nil, subject, APP_TOKENAPP, set.A.Token, label))
+  vars = &map[string]string{
+    "labelId": label.LabelId,
+    "groupId": set.A.C.GroupId,
+  }
+  label = &Label{}
+  assert.NoError(t, SendEndpointTest(SetLabelGroup, "POST", "/content/labels/{labelId}/groups/{groupId}", vars, nil, APP_TOKENAPP, set.A.Token, label))
+
+  // capture updated card on new assigned label
+  rev = GetTestRevision(set.C.Revisions)
+  assert.NoError(t, SendEndpointTest(GetCards, "GET", "/contact/cards?cardRevision=" + strconv.FormatInt(ver.Card, 10), nil, nil, APP_TOKENAPP, set.C.Token, &cards))
+  assert.Equal(t, 1, len(cards))
+  assert.NotEqual(t, viewRevision, cards[0].CardData.NotifiedView)
+  assert.NotEqual(t, labelRevision, cards[0].CardData.NotifiedLabel)
+  viewRevision = cards[0].CardData.NotifiedView
+  contentRevision = cards[0].CardData.NotifiedContent
+  labelRevision = cards[0].CardData.NotifiedLabel
+  ver = rev
+
+  // assign label to article
+  vars = &map[string]string{
+    "labelId": label.LabelId,
+    "articleId": article.ArticleId,
+  }
+  article = &Article{}
+  assert.NoError(t, SendEndpointTest(SetArticleLabel, "POST", "/content/articles/{articleId}/labels/{labelId}", vars, nil, APP_TOKENAPP, set.A.Token, article))
+
+  // capture updated card on assigned article
+  rev = GetTestRevision(set.C.Revisions)
+  assert.NoError(t, SendEndpointTest(GetCards, "GET", "/contact/cards?cardRevision=" + strconv.FormatInt(ver.Card, 10), nil, nil, APP_TOKENAPP, set.C.Token, &cards))
+  assert.Equal(t, 1, len(cards))
+  assert.NotEqual(t, contentRevision, cards[0].CardData.NotifiedContent)
+  ver = rev
+
+  // confirm c can see new article
+  articles = &[]Article{}
+  assert.NoError(t, SendEndpointTest(GetArticles, "GET", "/content/articles", nil, nil, APP_TOKENCONTACT, set.C.A.Token, articles))
+  assert.Equal(t, 1, len(*articles))
+  assert.Equal(t, (*articles)[0].ArticleId, article.ArticleId)
+  assert.Equal(t, 1, len((*articles)[0].ArticleData.Labels))
+  assert.Equal(t, (*articles)[0].ArticleData.Labels[0], label.LabelId)
+
+  // confirm b cannot see new article
+  articles = &[]Article{}
+  assert.NoError(t, SendEndpointTest(GetArticles, "GET", "/content/articles", nil, nil, APP_TOKENCONTACT, set.B.A.Token, articles))
+  assert.Equal(t, 1, len(*articles))
+  assert.NotEqual(t, article.ArticleId, (*articles)[0].ArticleId)
 }