Question

If the sender in a nonpersonal, paid promotion is identified, we define it as advertising. if the sender is not readily identified, we label it ____________.

Answer 1

If the sender is not readily identified, we label it propaganda.
Usually, propaganda is used to advertise political causes, and to persuade you into believing that particular promotion. They want you to join them, and to follow their leader, which is why they are promoting their own causes, whilst not identifying themselves.