In the 1970s Kaczyński was an activist in the pro-democratic anti-communist movement in Poland, the Workers' Defence Committee, as well as the Independent Trade Union movement.
Pada 1970-an, Kaczyński menjadi aktivis gerakan pro-demokrasi anti-Komunis di Polandia, Pekerja Komite Pertahanan, serta gerakan Serikat Buruh Independen.