He visited the site of the Katyn massacre, toured the Eastern Front, visited French volunteers and wrote, on his return to France, that he had gone from embracing a collaboration due to reason and rationality to being a collaborator for reasons of the heart (""De collaborationiste de raison, je suis devenu collaborationiste de coeur."") He published the names and addresses of Jews who had gone into hiding, called for the death of left-wing politicians, and in the summer of 1944 signed the call for the summary execution of all members of the French Resistance. He considered himself a "moderate" anti-Semite and was replaced as editor of "Je suis partout" in 1943 by the even more extreme Pierre-Antoine Cousteau. He was a member of the Groupe Collaboration, an initiative that encouraged close cultural ties between France and Germany. He went on to work for various journals, including "Révolution nationale" and "le Petit Parisien". After the liberation of Paris Brasillach hid in an attic, joking in his diary: "Jews have been living in cupboards for four years, why not imitate them?". He gave himself up on September 14 when he heard that his mother had been arrested. He spent the next five months in prison and continued his literary endeavours while incarcerated.