Collection of mainly stencilled and printed documents, supplemented with documents received by Willem G. Spiekman in his capacity of general secretary of the FIET 1934-1958. Files relating to congresses 1934-1973 (incomplete 1934-1958), consisting of agenda, resolutions, reports, speeches, attendance lists, circulars, clippings; files on the Executive Committee 1949-1962, 1974-1975, the Wages-Policy Committee 1960-1965, the Social Policy Committee 1961-1965 and on Sectional Committees 1954-1967, consisting of proceedings, reports, resolutions, circulars; files on Trade Sections Conferences 1934-1935, 1950-1970, consisting of proceedings, reports, resolutions, clippings; documents on the Arbeitsgemeinschaft der freien Angestelltengewerkschaften Mitteleuropas 1936, the Internationale Arbeitsgemeinschaft der Angestelltenjugend 1958-1968, ITS General Conferences 1965-1969, the Comité Syndical des Employés, Techniciens et Cadres FIET in the European Community 1965-1972, the European Regional Organisation of FIET (EURO-FIET) 1972-1981, the World Federation of Trade Unions (WFTU) 1946-1948, etc.; reports 1935, 1939, 1947-1949; circulars 1932-1939, 1947-1978; press releases 1964-1983; clipping on the founding congress 1904; typescript of W. Spiekman's memoirs, with notes and annexes, 1968; letters to W. Spiekman on the occasion of his retirement 1958. Accrual 2018: documents regarding the FIET and in particular its 24 World Congress 1994-1999; documents regarding the merger organisation Union Network International (UNI) and its 1st World Congress 2000-2002.