The Presidium of the Supreme Soviet was a Soviet governmental institution – a permanent body of the Supreme Soviets (parliaments). This body was of the all-Union level (Presidium of the Supreme Soviet of the Soviet Union), as well as in all Soviet republics (e.g., Presidium of the Supreme Soviet of the Byelorussian SSR) and autonomous republics. Structure and functions of the presidiums in these republics were virtually identical. The presidiums were elected by the Supreme Soviet to act on its behalf while the soviet was not in session. The chairman of the presidium was the de jure head of state.