Comité de défense des ouvriers
Between 1956 and 1957 Lipski was an editor of the pro-reform weekly "Po prostu"; from 1957 to 1959 he was president of the Crooked Circle Club. In 1964 Lipski organized the Letter of the 34 (objecting the expansion of censorship in communist Poland). In 1975 he signed the Letter of 59 and in 1976 he co-funded the Workers' Defence Committee (Komitet Obrony Robotnikow); as one of the most active members of this organization he organized help for the workers who protested in June 1976 against the government sponsored price increases in Radom and in Ursus district of Warsaw.