The trained office assistant Ohlhof joined the SPD and worked from 1908 to 1911 as a commercial clerk at the consumer cooperatives in Hamburg and in the following years until 1921 as a full-time employee at independent employee associations in Berlin, where he was also a member of the local executive committee of the Charlottenburg SPD. He was a member of the “press commission” of the SPD central organ Vorwärts and was appointed editor of the local SPD daily Volkszeitung in Mainz in 1923 , where he was also elected to the city council in 1927. He resolutely rejected the privatization of gas and electricity generation discussed at the end of the 1920s and contributed to the establishment of the communal “Kraftwerke Mainz-Wiesbaden”, which still exists today. In view of the great housing shortage in Mainz, he was also one of the initiators and managing directors of the “Gemeinnützige Bau- und Siedlungs-Gesellschaft eGmbH”, which built the “Ebert-Siedlung”.
Ohlhof, which belongs to the left wing of the SPD, was one of the co-founders of the Mainz local branch of the SAPD in 1931 and was elected to the state parliament of the People's State of Hesse in November 1931 on the SAP list . Ohlhof formed the parliamentary group of the SAPD together with Heinrich Galm, who came from the KPO , but unlike Galm he lost his mandate in the new elections in July 1932.
During the Nazi era was Ohlhof 1936-1945 first in the Gestapo prison Frankfurt / Main, then in prison Butzbach and from December 1943 until the liberation in 1945 in the Buchenwald concentration camp (where he, together with Erich Melcher was among a group of SAPD members their closely cooperated with the Trotskyists imprisoned there) imprisoned on charges of “preparation for high treason ”. In 1945 Ohlhof returned to Mainz, was appointed to the city committee and set up the “municipal support center for politically, racially and religiously persecuted people”. In addition, he was appointed by the French military administration in October 1945 to the editorial office of the “New Mainzer Gazette”, which was made up of representatives from all political (democratic) groups. Ohlhof joined the KPD , which was re-approved in early February 1946 .
On February 18, 1946, Ohlhof was killed in a car accident; his grave is in the main cemetery in Mainz .
In Mainz Hartenberg-Münchfeld a street is named after Fritz Ohlhof.
- Hedwig Brüchert-Schunk: Urban Social Policy from the Wilhelminian Empire to the Great Depression. A social and communal historical study using the example of the city of Mainz 1890–1930. (Geschichtliche Landeskunde 41), Stuttgart 1994, p. 316, 343-347 u. 391.
- Dieter Ertl: Against the policy of tolerance of the presidential cabinets - on the history of the Socialist Workers' Party of Germany in Mainz, in: Kaiserreich und Weimarer Republik, Mainzer Geschichtsblätter Heft 4, Mainz 1987, pp. 112-129.
- Jochen Lengemann : MdL Hessen. 1808-1996. Biographical index (= political and parliamentary history of the state of Hesse. Vol. 14 = publications of the Historical Commission for Hesse. Vol. 48, 7). Elwert, Marburg 1996, ISBN 3-7708-1071-6 , p. 285.
- Stephan Pieroth: Political parties and the press in Rhineland-Palatinate 1945–1971. A contribution to media history with special consideration of the Mainz SPD newspaper “Die Freiheit” (published by the Parliament's commission for the history of Rhineland-Palatinate, 18), Mainz 1994, p. 211 and 868
- Klaus-Dieter Rack, Bernd Vielsmeier: Hessian MPs 1820–1933. Biographical evidence for the first and second chambers of the state estates of the Grand Duchy of Hesse 1820–1918 and the state parliament of the People's State of Hesse 1919–1933 (= Political and parliamentary history of the State of Hesse. Vol. 19 = Work of the Hessian Historical Commission. NF Vol. 29) . Hessian Historical Commission, Darmstadt 2008, ISBN 978-3-88443-052-1 , No. 648.
- Ohlhof, Fritz . In: Hermann Weber , Andreas Herbst : German Communists. Biographisches Handbuch 1918 to 1945. 2nd, revised and greatly expanded edition. Dietz, Berlin 2008, ISBN 978-3-320-02130-6 .
- Fritz Ohlhof's biography . In: Wilhelm H. Schröder : Social Democratic Parliamentarians in the German Reich and Landtag 1876–1933 (BIOSOP)
- Ohlhof, Fritz Johannes. Hessian biography. (As of February 18, 2020). In: Landesgeschichtliches Informationssystem Hessen (LAGIS).
- Entry on Fritz Ohlhof in the Rhineland-Palatinate personal database
|ALTERNATIVE NAMES||Ohlhoff, Fritz|
|BRIEF DESCRIPTION||German socialist politician and trade unionist|
|DATE OF BIRTH||December 3, 1889|
|PLACE OF BIRTH||Hamburg|
|DATE OF DEATH||February 18, 1946|
|Place of death||Mainz|