File is an audio reel containing an interview with labour activist and historian Mike Earle. Earle spoke with CKDU's Ken Burke about coal-mining labour unions in Cape Breton before and during the Depression. The interview aired July 8, 1986 and was rebroadcast June 1, 1988 at 1:30 pm; June 6, 1988 at 7:30 am; June 13, 1988 at 6:10 am; and February 14, 1989 at 12:16 pm.