Final answer:
The Soviet Union staged an armed intervention in Hungary in the 1950s to suppress a revolt against the communist government and maintain control.
Step-by-step explanation:
The Soviet Union staged an armed intervention in Hungary in the 1950s. In 1956, thousands of Hungarians revolted against the communist government and demanded democratic reforms and freedom from Soviet oppression. However, the Soviet Union quickly responded by sending tanks and troops to suppress the rebellion and maintain control over Hungary.