The CTKL fonds receives its title from Canadan Teollisuusunionistinen Kannatus Liitto, the Finnish organization which translates to the Canadian Industrial Union Support Circle. This organization was the majority shareholder of the Labour Temple at 314 Bay Street in Port Arthur from 1925 to 1972 and was disbanded in 1979. Prior to 1926, the central administration of the CTKL was in Sudbury after which it relocated to Port Arthur.

The CTKL was made up of supporters of industrial unionism who formed associations in their own local communities and observed rules and regulations as established by an executive committee. This executive committee, the Toimeenpanevakomitea (TPK), was comprised of members of the CTKL elected annually from the central administration and from the local associations. This committee managed the affairs of the league and supported industrial unionism through agitation by engaging speakers, supporting workers in their union activities, and through monetary assistance, as well as writing, publishing, and distributing written materials.

Significant cultural and social events at the Labour Temple and at other branches were supported by the CTKL during the peak years of labour organization.

The records contain minutes of meetings, correspondence, financial records, publications, and miscellaneous items. The fonds has been divided into series as follows:
A - Finnish Building Company
B - Hoito Restaurant
C - One Big Union
D - CTKL
E - Industrial Workers of the World
F - Lumber Workers Industrial Union #120
G - Canadian News Service
H - Miscellaneous

Collection is organized into the following series:
I. Hoito Restaurant
II. Port Arthur Workingmen’s Association: Imatra no. 9
III. C.T.K.L. (Canadian Industrial Unions: Port Arthur’s Finnish Association)
IV. C.U.T. (Canadian News Service) and C.T.K.L.
V. Finlandia Club
VI. Finnish Socialist Local no. 6: Port Arthur
VII. Lumber Workers’ Industrial Union of the One Big Union
VIII. New Attempt Temperance Society
IX. Finnish Athletic Club: Nahjus
X. Finnish Building Company
XI. Miscellaneous

The Hoito Cooperative Restaurant was established in 1918, to serve the needs of Finnish-Canadian workers in Port Arthur, and still operates from the Finnish Labour Temple, 314 Bay Street.

This collection is made up of minute books and account books covering the early years of the restaurant's operations.

The fonds consists of publications and clippings in Finnish, including some of Terttu Koivu’s own writings in Canadan Uutiset and other publications. Terttu Koivu immigrated from Finland in 1953, and died in Thunder Bay in 2013 at age 95.