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William Kalush and Larry Sloman, The Secret Life of Houdini: The Making of America’s First Superhero. New York: Atria Books, 2007, p. 338—
[In April 1917, on the day after the US had entered World War I, American magician Harry] Houdini introduced a resolution at the Society of American Magicians’ [SAM] meeting that was unanimously passed that “its members collectively and individually do hereby tender their loyalty to the President of the United States of America and express a desire to render such service to the country as may be within their province.”…
Houdini led the war efforts of magicians by example. On June 2, Houdini was nominated for president of the SAM and elected unanimously without opposition. Taking control of the house organ, M-U-M, Houdini began filling the pages with news of the SAM members' contributions to the war cause, and even reproduced an article from The New York Times that described how the US government was actively seeking magicians and mystifiers to aid in the wartime effort.
Fellow magicians took up Houdini's call. Archie Engel, a Washington DC, magician, became a secret agent for the Treasury Department during the war. Dr. Maximllian Toch, a chemist and New York City SAM member, was put in charge of the military's camouflage division and, working with other magicians, he developed the battleship gray formula used by the US Navy. Toch’s chemical expertise was also used in devising ways to transmit secret messages. Eventually, a camouflage section of the Regular US Army Engineers was formed and the SAM members from all over the country enlisted in it and shared their expertise for the war effort. An amateur magician named Dr. Charles Mendelsohn, who was an expert cryptographer, was put in charge of deciphering German codes for the U.S. Military lntelligence Division. Even before we entered the war, the Department of Justice hired a magician named Wilbur Weber to do counterintelligence on German spies who were operating in the Northwest. He used his magic tour as a cover for his spying activities.
