Dopo la guerra fu eletto sindaco di Varsavia (1945), fu nominato viceministro della Difesa (1945-1949) e aderì al Partito Operaio Unificato quando i comunisti vi confluirono (1949). ###>After the war he held a number of offices in the communist government of Poland, one of his first being mayor of Warsaw (18 September 1944 – March 1945), with the war still in progress.