Take the following as truth: The Soviets themselves imprisoned some 1.5 million Poles in labor camps of their own and eliminated potential troublemakers through actions like the Katyn massacre, in which 4,500 Polish military officers were summarily executed.
Then the following statement: "During the 1950s, the Soviet Union put Poles in prison camps and executed around 4500 Polish military officers." is true, false, or inconclusive?