noun, masculine
short for Direction Centrale des Renseignements Généraux (“Central Directorate of General Intelligence”) (DCRG), a former French intelligence service; a member of the DCRG, usually working as plain-clothes police or incognito
“il y a des RG infiltrés à la manifestation” — there are plain-clothes policemen infiltrated in the demonstration
Acronym of renseignements généraux (“general intelligence [service]”).