 He was also instrumental in obtaining the cooperation of the Communist resistance groups, who had been reluctant to accept De Gaulle as their leader, because Moulin was known as a left-wing republican.In his work in shepherding the Resistance, Moulin was aided by his private administrative assistant, Laure Diebold.On 21 June 1943, he was arrested at a meeting with fellow Resistance leaders in the home of Frédéric Dugoujon in Caluire-et-Cuire, a suburb of Lyon, as were Dugoujon, Henri Aubry (alias Avricourt and Thomas), Raymond Aubrac, Bruno Larat (alias Xavier-Laurent Parisot), André Lassagne (alias Lombard), Colonel Albert Lacaze, Colonel (alias Blumstein) and René Hardy (alias Didot).