When, in 1941, Gestapo officers under the orders of Klaus Barbie stormed the house in Caluire where the French Resistance leadership was secretly meeting, only Hardy was not put in handcuffs. As the other 7 men were led away, Hardy successfully made a break for it. The incident seemed suspicious to Aubrac who, based on the ease with which the Nazis had let him go, always remained convinced that Hardy had alerted the Gestapo of their meeting. “From all the Germans with their submachine guns, there were only a couple of scattered shots,” Aubrac later stated.
After the war, he was tried twice for collaboration for a number of reasons, but was found not guilty, despite committing perjury at the first trial. Shortly before his death he was accused again by Klaus Barbie himself, but died before any new charges could be brought.