Lech Wałęsa
He gained much media attention following the 2008 publication of a book he co-authored with Piotr Gontarczyk, "SB a Lech Wałęsa. Przyczynek do biografii" (The SB and Lech Wałęsa: Contribution to a Biography), about Lech Wałęsa's service as an informant of the communist "Służba Bezpieczeństwa". Gontarczyk and Cenckiewicz argued that in the 1970s the Solidarity (Polish trade union) leader and former President of Poland Lech Wałęsa was a secret informant for the Polish communist secret police, the "Służba Bezpieczeństwa" ("SB").