In the waning days of the communist state, Bielecki, along with fellow Gdańsk liberals Janusz Lewandowski, Donald Tusk and Jacek Merkel, founded the Gdańsk Society for Socio-Economic Development, an informal organization of intellectual liberal dissidents, who became known as the "Congress Liberals." In the partially free 1989 parliamentary elections, Bielecki was elected to the Sejm as a member of the Solidarity Citizens' Committee. During the splintering of the Solidarity Citizens' Movement throughout 1990, Bielecki and other Gdańsk intellectuals increasingly favoured a liberal approach to reform the Polish economy. Congress Liberal members, including Bielecki, voted to create the Liberal Democratic Congress (KLD) in June 1990 in order to contest parliamentary elections. The new party advocated pragmatic liberalism, privatization, the expansion of Poland's newly free market, and European integration. The party, along with Bielecki, also supported Lech Wałęsa in the 1990 presidential election.