László Rajk was a Hungarian Communist politician, who served as Minister of Interior and Minister of Foreign Affairs. He was an important organizer of the Hungarian Communists' power, but he eventually fell victim to Mátyás Rákosi's show trials.

The State Protection Authority was the secret police of the People's Republic of Hungary from 1945 to 1956. The ÁVH was conceived as an external appendage of the Soviet Union's KGB in Hungary responsible for supporting the ruling Hungarian Working People's Party and persecuting political criminals. The ÁVH gained a reputation for brutality during a series of purges but was gradually reined in under the government of Imre Nagy, a moderate reformer, after he was appointed Prime Minister of Hungary in 1953. The ÁVH was dissolved by Nagy's revolutionary government during the Hungarian Revolution of 1956 and succeeded by the Ministry of Internal Affairs III.