The fonds consists of records of several of the early Peterborough Unions. Included are: Moulders' Local 191, Journeymen Tailors 23, Bricklayers 17, Painters and Decorators 370 and 725, United Brotherhood of Carpenters 672, Barbers 402, Pattern Makers, Machinists 286 and Operating Engineers 690, the International Union of Steam and Operating Engineers and the Amalgamated Meat Cutters and Butcher Workmen," 1917 [in Polish]. Original correspondence from sister unions in Canada is included as well as large volumes of correspondence from the American headquarters of each local. In addition there are several original minute books, secretaries' books, and treasurer's reports for the locals. Published material includes circulars, by-laws, rules of order and constitutions. There are also records dealing with the Peterborough Trades and Labour Council (1902), the Labour Educational Association of Ontario, the Trades and Labour Congress of Canada and the American Federation of Labour, material from the latter two being mostly in the form of circular-type letters.