context: After Stalin's death (1953), Imre Nagy, a reformist and nationalist, became prime minister. On October 23, 1956, students and workers marched to the Houses of Parliament to expose the country's grievances. Opposition surged and the Prime Minister announced Hungary's resignation from the Warsaw Pact. Imre Nagy requested international assistance. However, the Western superpowers did not dare to intervene (except for humanitarian aid), so the Soviet army defeated the uprising with tanks. Nagy and thousands of others were executed. [17] Communist leader Mátyás Rákosi was expelled to Siberia. Rákos succeeded János Kádár, who put an end to security police atrocities and released some of the political prisoners by the early 1960s. However, Hungary remained a socialist state, but the communist coat of arms was removed from the flag.
question: Who was the chairman of the Hungarian Communist Party at the start of the 1956 uprising?
answers.text: Mátyás Rákosi