Since 2002, Rebengiuc has been a member of the non-governmental organization "Asociaţia Revoluţionarilor fără Privilegii" (Association of Non-Privileged Revolutionaries), alongside Ion Caramitru, Dan Pavel, Radu Filipescu and others. In reference to the goal behind this group, Filipescu states: "The Association was established as a reaction to the very active organizations of revolutionaries, which were mostly active in demanding material gains. Ultimately, the situation arose where joining an association of revolutionaries had the connotation of pursuing material gains, privileges." He is also a member of the Group for Social Dialog (GDS), a platform for reform-minded intellectuals. As of 2005, he was, with fellow revolutionary Mircea Diaconu, one of the two actors among its 48 members.