who was he?
A Hungarian communist politician.
Mátyás Rákosi
Mátyás Rákosi (9 March 1892 – 5 February 1971) was a Hungarian communist politician. He was born Mátyás Rosenfeld in Ada (present-day Serbia). Rákosi was the leader of Hungary's communist party from 1945 to 1956 — first as General Secretary of the Hungarian Communist Party (1945–48) and later holding the same post with the Hungarian Working People's Party (1948–56). As such, from 1949-56, he was the "de facto" ruler of the Hungarian People's Republic. 
explain 2 consequences of the hungarian uprising in 1956 The revolt spread quickly and the government collapsed. who did they revolt against? the Hungarian People's Republic and its Soviet-imposed policies what was the basic reason for this revolt? Hungary became a socialist state under the authoritarian leadership of Mátyás Rákosi. Under Rákosi's government, the Security Police (ÁVH) began a series of purges, first within the Communist Party to end opposition to Rákosi's policies. you mentioned about a republic; when was it formed? 20 August 1949 who formed it? Mátyás Rákosi
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Mátyás Rákosi [SEP] Introduction
Mátyás Rákosi (9 March 1892 – 5 February 1971) was a Hungarian communist politician. He was born Mátyás Rosenfeld in Ada (present-day Serbia). Rákosi was the leader of Hungary's communist party from 1945 to 1956 — first as General Secretary of the Hungarian Communist Party (1945–48) and later holding the same post with the Hungarian Working People's Party (1948–56). As such, from 1949-56, he was the "de facto" ruler of the Hungarian People's Republic. An ardent Stalinist, his government was very loyal to the Soviet Union, and he presided over the mass imprisonment of hundreds of thousands of Hungarian people and the deaths of thousands.