In 1972, on the initiative of Edward Gierek, Jablonski was chosen the de iure leader (chairman of the Council of State) of the People's Republic of Poland. From 1976 to 1983 he was a chief of the Front of National Unity (FJN, Front Jedności Narodu). From 1983 to 1990 he was chief of ZBoWiD, the Society of Fighters for Freedom and Democracy, an organisation of war veterans. In 1985 he was replaced as head of state by General Wojciech Jaruzelski. His wife Jadwiga Jabłońska died in 1999.