In which countries in 1919-1939 did the communists use tactics of fighting political opponents similar to the one that brought

In which countries in 1919-1939 did the communists use tactics of fighting political opponents similar to the one that brought them to power in Eastern Europe?

1) This is Poland, when on September 17, 1939, the USSR army crossed the western border of the country under the guise of a “peaceful campaign”, ostensibly to liberate the Ukrainians and Belarusians oppressed by Poland, Stalin’s real goal was to get his part of Poland and establish a communist regime there, naturally.
2) In June 1940, Soviet troops occupied the Baltic states (Estonia, Latvia, Lithuania) and placed their military bases there. The communists of these countries organized mass manifestos demanding entry into the USSR. In August 1940, these three republics joined the USSR. Tough repressions against the opponents of the new communist regime immediately began there.