How did the USSR's influence spread through Europe? Russian Expansion

In response to the Marshall Plan it became clear that Stalin needed to introduce a clearer policy in Eastern Europe. He invited the leaders of Eastern Europe to a conference in Poland to discuss the setting up of the Communist Information Bureau (Cominform), which would co-ordinate the policies and tactics of the communists parties in both satellite states and Western Europe. Stalin's representative claimed that the world was now divided in two hostile camps and that the policy of co-operating with the western socialist parties would have to be abandoned. Communist parties were encouraged to take power in themselves!!!