Name some aggressive actions and war crimes cmmitted by the Soviets during World War 2?

Answer 1

The Katyn massacre comes to mind immediately. Here is and excerpt on it from Wikipedia: The Katyn massacre, also known as the Katyn Forest massacre (Polish: zbrodnia katyńska, 'Katyń crime'), was a mass execution of Polish military officers, policemen and civilian prisoners of war ordered by Soviet authorities on March 5, 1940.[1][2] The number of victims is estimated at about 22,000, with the most commonly cited number of 21,768.[3] The victims were murdered in the Katyn forest in Russia, the Kalinin (Tver) and Kharkiv prisons and elsewhere.[4] About 8,000 were officers taken prisoner during the 1939 Soviet invasion of Poland, the rest being Poles arrested for allegedly being "intelligence agents, gendarmes, spies, saboteurs, landowners, factory owners, lawyers, priests, and officials."[3] Since Poland's conscription system required every unexempted university graduate to become a reserve officer,[5] the Soviets were able to round up much of the Polish intelligentsia, and the Jewish, Ukrainian, Georgian[6] and Belarusian intelligentsia of Polish citizenship.

Interestingly, the Soviets tried to pin the blame for the massacre on the Germans during the IMT war crimes trials in Nurenburg after the war, much to the consternation of the English, Americans, and French. To avoid offending the Russians, who were also sitting in judgment of the Germans, they merely stated that the charge was 'not proved'. They knew all along that the Russians had done it, and russia finally admitted her guilt for the atrocity in 1990.