How did the Soviet Union deal with satellite nations who tried to become independent (Hungary/Poland/Czechoslovakia)?

Which one of these best describes an interest group

During the invasion of the soviet union, the einsatzgruppen did which of the following? killed large numbers of jews, as well as many locals. led military troops. eliminated local administration in lithuania. took over many administrative functions in the war effort. planned and organized extermination camps.

Why did the united states pass the neutrality acts