 It also passed the SRU Law forcing each commune to have a 20% quota of housing projects, the 15 June 2000 Guigou law on presumption of innocence, the Taubira Law recognizing slavery as a crime against humanity, and the LSQ law concerning security.Furthermore, Jospin's government carried out a partial regularization of undocumented immigrants.During the 1970s, the PS, the PCF and the Left-wing Radicals formed the "Union of Left" based on a Common Program (1972).