Why did Russians imprison poles during World War 2?

During World War II, the Soviet Union, which included Russia, imprisoned Poles for several reasons. Following the 1939 invasion of Poland, the Soviets sought to eliminate potential opposition and consolidate control over the territory. Many Poles, especially military officers, intellectuals, and political leaders, were seen as threats to Soviet authority and were subjected to mass arrests, deportations, and forced labor. This repression was part of a broader strategy to suppress nationalist movements and integrate the region into the Soviet sphere of influence.