1. Stalin feared that Party members were plotting against him so he launched the Great Purge where secret police targeted Old Bolsheviks, party activists, and eventually ordinary citizens who were then charged with counterrevolutionary plots or failing to meet production quotas
2. Stalin put on "show trials" where former Communist leaders confessed to crimes after officials tortured them or threatened their family
3. Purged party members were forced to labor camps or killed, death toll was more than 4 million
4. Purges increase Stalin's power, old revolutionaries replaced by new party members loyal to Stalin and now Soviets were aware of the consequences of disloyalty
5. Stalin's Purge killed many military officers and the loss of military leaders affected the Soviet Union