diff --git a/LeStorage/Store.swift b/LeStorage/Store.swift
index ece0ab4..5bb20cb 100644
--- a/LeStorage/Store.swift
+++ b/LeStorage/Store.swift
@@ -71,6 +71,8 @@ public class Store {
     
     fileprivate var _failedAPICallsCollection: StoredCollection<FailedAPICall>? = nil
     
+    fileprivate var blackListedUserName: [String] = []
+    
     public init() {
         FileManager.default.createDirectoryInDocuments(directoryName: Store.storageDirectory)
     }
@@ -327,4 +329,16 @@ public class Store {
 
     }
     
+    public func blackListUserName(_ userName: String) {
+        self.blackListedUserName.append(userName)
+    }
+    
+    func userIsAllowed() -> Bool {
+        guard let userName = self.userName() else {
+            return true
+        }
+        let isAllowed = !self.blackListedUserName.contains(where: { $0 == userName } )
+        return !self.blackListedUserName.contains(where: { $0 == userName } )
+    }
+    
 }
diff --git a/LeStorage/StoredCollection.swift b/LeStorage/StoredCollection.swift
index c14558e..d300e68 100644
--- a/LeStorage/StoredCollection.swift
+++ b/LeStorage/StoredCollection.swift
@@ -433,7 +433,7 @@ public class StoredCollection<T: Storable>: RandomAccessCollection, SomeCollecti
     
     /// Sends an insert api call for the provided [instance]
     fileprivate func _sendInsertionIfNecessary(_ instance: T) {
-        guard self.synchronized, Store.main.collectionsCanSynchronize else {
+        guard self.synchronized, self._canSynchronise() else {
             return
         }
         Task {
@@ -443,7 +443,7 @@ public class StoredCollection<T: Storable>: RandomAccessCollection, SomeCollecti
     
     /// Sends an update api call for the provided [instance]
     fileprivate func _sendUpdateIfNecessary(_ instance: T) {
-        guard self.synchronized, self._sendsUpdate, Store.main.collectionsCanSynchronize else {
+        guard self.synchronized, self._sendsUpdate, self._canSynchronise() else {
             return
         }
         Task {
@@ -453,7 +453,7 @@ public class StoredCollection<T: Storable>: RandomAccessCollection, SomeCollecti
     
     /// Sends an delete api call for the provided [instance]
     fileprivate func _sendDeletionIfNecessary(_ instance: T) {
-        guard self.synchronized, Store.main.collectionsCanSynchronize else {
+        guard self.synchronized, self._canSynchronise() else {
             return
         }
         Task {
@@ -461,6 +461,10 @@ public class StoredCollection<T: Storable>: RandomAccessCollection, SomeCollecti
         }
     }
     
+    fileprivate func _canSynchronise() -> Bool {
+        return Store.main.collectionsCanSynchronize && Store.main.userIsAllowed()
+    }
+    
     /// Reschedule the api calls if possible
     func rescheduleApiCallsIfNecessary() {
         Task {