Union of Polish Patriots was a political body created by Polish communists in the Soviet Union in 1943. The ZPP, unofficially controlled and directed by Joseph Stalin, became one of the founding structures of the Soviet-controlled communist government that after World War II took power in Poland.

The history of Poland from 1945 to 1989 spans the period of Marxist–Leninist regime in Poland after the end of World War II. These years, while featuring general industrialization, urbanization and many improvements in the standard of living,[a1] were marred by early Stalinist repressions, social unrest, political strife and severe economic difficulties. Near the end of World War II, the advancing Soviet Red Army, along with the Polish Armed Forces in the East, pushed out the Nazi German forces from occupied Poland. In February 1945, the Yalta Conference sanctioned the formation of a provisional government of Poland from a compromise coalition, until postwar elections. Joseph Stalin, the leader of the Soviet Union, manipulated the implementation of that ruling. A practically communist-controlled Provisional Government of National Unity was formed in Warsaw by ignoring the Polish government-in-exile based in London since 1940.