Original sentence: Under the leadership of Bolesław Bierut, the People's Republic of Poland by the late 1940s became a part of the Eastern bloc and a satellite state of the Soviet Union.With little opposition from the Western Allies, who had accepted the fait accompli at the Yalta Conference, the Soviet-backed Polish Communists, soon forced the opposition (the delegates of the Polish government in exile, the members of the Armia Krajowa resistance movement and any non-communist political parties) to either join them or face being exiled, imprisoned or even executed
Edited sentence: Under the leadership of Bolesław Bierut, the People's Republic of Poland by the late 1940s became a part of the Eastern bloc and a puppet state of the Soviet Union.With little opposition from the Western Allies, who had accepted the fait accompli at the Yalta Conference, Stalin's agents, the Polish Communists, soon forced the opposition (the delegates of the Polish government in exile, the members of the Armia Krajowa resistance movement and any non-communist political parties) to either join them or face being exiled, imprisoned or even executed