In the 1970s Lech Kaczyński was an activist in the pro-democratic anti-Communist movement in Poland, Workers' Defence Committee, as well as the Independent Trade Union movement.
Zanter den 1970er Jore war hien an der pro-demokratescher, anti-kommunistescher Bewegung a Polen, dem Verdeedegungscomité vun den Aarbechter, an der onofhängeger Gewerkschaftsbewegung aktiv.