 As well as his extensive writing on behalf of La Cagoule Jeantet also played a leading in gun-running for the organisation, smuggling weapons into France from like-minded groups Fascist Italy and Nationalist Spain, as well as Belgium and Switzerland.Following the Battle of France and the establishment of the Vichy Regime Jeantet, who became a supporter of collaboration with the Nazis, was brought into Philippe Pétain's government as "inspecteur général à la propagande".However, when his initial enthusiasm for collaboration waned, due in large part to the high degree of control exercised by the occupying Germans, Jeantet followed the lead of Deloncle in resigning from the Vichy government in 1942.