 In a December 10, 1917 letter, the informant reported that Liebold had been recently caught in his office showing the blueprints of the Liberty L-12 (an aircraft engine manufactured by the Ford Motor Company for the U.S. Army) to a reporter for the "New Yorker Staats-Zeitung"; in the same letter, the informant writes that it was Liebold himself who coordinated Henry Ford's 1915 pacifist campaign, culminated in the ruinous Peace Ship expedition.The probe, suspended in October 1918, eventually turned up nothing.A later investigation carried out by John Bugas showed that Liebold "had close ties" to one of the members of the Duquesne Spy Ring, the network of Nazi spies dismantled in 1941; however, Burgas "ultimately found Liebold to be harmless."