The materials in this fonds consists of correspondence, reports, and minutes to and from Klassen in his role as an administrator and advocate for Mennonite refugees. There is lengthy correspondence with Cornelius A. DeFehr (C.A. DeFehr) and Benjamin H. Unruh (B.H. Unruh). Correspondence is with M.C.C. board members such as H.S. Bender and Orie O. Miller. The documents reflect Klassen's activities with relief organizations, settlement of Mennonites in Paraguay, Brazil, and Mexico, travel debt repayment, world conferences, and his involvement with such issues as non-resistance. Also included are documents to and from important organizations such as the Canadian Mennonite Board of Colonization, Mennonite Central Relief Committee Canada (MCRC), Canadian Mennonite Relief and Immigration Council (CMRIC), which later joined to form the Mennonite Central Committee Canada (MCC) in 1963. This material shows the difficult situation the refugees in Russia faced and how Mennonites in Canada, the United States, and to a lesser extent in Germany and Holland tried to help them through financial and material as well as emigration to Canada and South America. Some of the material is dated well after Klassen's death and this material tends to be connected with C.A. DeFehr and to a lesser extent G.H. Sukkau. The fonds also contains some bibliographic material of a personal and family nature such as a fiftieth birthday celebration event, tributes, funeral, and articles "Er Kann" by H.F. Klassen, written about C.F. Klassen, Mennonitische Rundschau 27 September to 13 December 1972 The photographs are of churches that Russian Mennonite immigrants had erected or acquired in Canada after 1923 and of the occasion of Sir Edward Beatty's and Colonel J.S. Dennis's visit to the Mennonite settlement at Coaldale on September 19, 1937. (See Mennonite Brethren Herald 4 February 1977, p. 18). Other photos are of Klassen's work in Europe. Located in the CMBS tape collection is a tape that Klassen sent to his family in North America for Christmas, 1952. Another tape consists of reports from MCC workers in Germany. Reporting are Martha Thiessen, Helen Janz, Sigfried Janzen, Margaret Janzen, and C.F. Klassen, 1950. There are also cassettes in the form of tributes to Klassen.