Original: The Warsaw Treaty ( 1955 â '' 91 ) is the informal name for the Treaty of Friendship , Cooperation and Mutual Assistance , commonly known as the Warsaw Pact , creating the Warsaw Treaty Organization . The treaty was a mutual defense treaty subscribed to by eight communist states in Eastern Europe .
Simplified: The Warsaw Pact or Warsaw Treaty Organization was officially named the Treaty of Friendship , Co-operation and Mutual Assistance , and was an organization of Central and Eastern European Communist states .