This term refers to political movements during the 1950's which aimed to eradicate Joseph Stalin's influence in the Soviet Union following his death. You can refer to Stalin's influence as "Stalinism"
I believe this is the answer:
It was feared that France would get allies (particularly Russian ones) so in order to prevent that Germany became Allies with 2 other countries to isolate France. This allowed Bismark, who had the idea, to continue with his plans.
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It was caused by collectivization. The food was gathered than taken away from the Ukrainian people.