shoefly
 n.— «Shoefly. Labor spy.» —“Transit” by Jose Casey, Dispatcher, Fifth Ave. Coach Co., 135th St. & Bdwy, N.Y.C.; CIO Transport Workers Union, 153 WEst 64th St., N.Y.C., Coachmen’s Division; Greulich; Rosenberg in New York City Lexicon of Trade Jargon , 1938-39. (source: Double-Tongued Dictionary)

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