What actions did Stalin take to spread communism between 1945 and 1949?

Some major Stalin's actions in 1945-49 were:

- Soviet armies sent to liberate Eastern Europe from the Nazis in WWII stayed and occupied those countries, turning into a factor of political control and pressure;

- the Berlin blockade of 1948;

- controlled elections to put communist candidates in office in Czechoslovakia and other nations;

- active support for communist armies in China, a major factor in their victory in 1949.