With Bronisław Wildstein, he initiated the establishment of the Student Solidarity Committee in Kraków after the death of Stanisław Pyjas in 1977.
On November 6, 2001, "Rzeczpospolita" published an open letter from the activists of the Krakow SKS, accusing Lesław Maleszka of collaborating with the Security Service of the People's Republic of Poland.
In response, on November 7, the deputy editor-in-chief of "Tygodnik Powszechny" and former Minister of Internal Affairs, Krzysztof Kozłowski, accused SKS activists of unreliability and undermined the credibility of the SB materials.
[2] According to the Institute of National Remembrance, Lesław Maleszka's cooperation was much more extensive and voluntary than he himself admitted.
Lesław Maleszka collaborated under several pseudonyms, independently suggesting to the Security Service to adopt a stricter policy towards opposition activists.