The fonds consists of correspondence and subject files pertaining to various locals of the International Association of Machinists. Also included is material from the B.C. Federation of Labour, Canadian Congress of Labour (1970-1984), Ontario Federation of Labour (1972- 1977), the provincial and federal CCF and NDP, as well as other material pertaining to labour and politics. There are also tapes of radio broadcasts and material relating to Thayer's personal interests.
Thayer, Harold, 1918-