Page "Służba Bezpieczeństwa" Paragraph 51

After it was renamed as the SB in 1956, it entered a period of relative inaction during the era of reform instituted by Władysław Gomułka.

However, after 1968, it was revived as a stronger body and became responsible for implementing political repression, most notably in the case of the Solidarity movement, the leader of which, Lech Wałęsa, was under constant SB surveillance, until its replacement by the Urząd Ochrony Państwa in 1990 after the fall of communism.