After coming back to LOCATION@1 in May NUMBER@1 , he participated in the founding of the underground group Socialisme et Liberté with other writers PERSON@1 , PERSON@2 , Jean-Toussaint , PERSON@3 , PERSON@4 , and ORGANIZATION@1 students .

He made friends with other writers and thinkers such as PERSON@2 , Jean-Toussaint and PERSON@3 , and PERSON@4 .
