A treaty between the eastern bloc nations and the USSR to protect against NATO interferance, specifically in
East Germany. Signed in 1955, the member states were the USSR, Poland, East Germany, Hungary, Albania, Romania,
Czechoslovakia and bulgaria. It was an alliance of the "red" countries, except for former Yugoslavia, and later Albania would exclude itself. They basically would defend eachother if one was attacked. With the mighty Soviet union on thier side, no-one dared attempt this.
Communism killer
Mikhail Gorbachev later took measures to abolish this treaty, allowing the member nation to do as the liked from December 1988. This lead to the tearing down of the Berlin Wall and the pact was ripped up completely as the USSR disbanded into the CIS nations.