Béla Kun (20 February 1886 – 29 August 1938), born Béla Kohn, was a Hungarian Communist activist and politician. He was the leader of the Hungarian Soviet Republic. He was the perpetrator of the Red Terror in 1919.
Though the de jure leader of the Hungarian Soviet Republic was president Sándor Garbai, the de facto power was in the hands of foreign minister Béla Kun. Kun maintained direct contact with Vladimir Lenin via radiotelegraph. It was Lenin who gave the direct orders and advice to Kun by constant radio communication with the Kremlin.
Following the collapse of the Hungarian Soviet Republic, Kun had fled to the Soviet Union, where he worked as a functionary in the Communist International bureaucracy as the head of the Crimean Revolutionary Committee from 1920. He organized and actively participated in the Red Terror in the area in Crimea (1920–1921), following which he participated in the March Action (1921), a failed Communist uprising in Germany.