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Michigan State Police officer, 1923-1941, Michigan Civil Defense Director during World War II, State Police Commissioner, 1947-1951, Republican candidate for governor, 1954, served on Michigan Liquor Commissioner and as Detroit Recorders Court judge. Papers include extensive documentation of his service as Director of Civil Defense and State Police Commissioner and his political activities.

The Donald S. Leonard collection is a valuable resource to researchers studying topics of law enforcement and civil defense and Michigan state politics and government. The Donald S. Leonard collection has been arranged into seven series: Personal and Correspondence, 1925-1966; Civil Defense; World War II Era, 1941-1946; Michigan State Police, 1929-1952; Detroit Police Department, 1952-1954; Political Files, 1950-1956; Organization and Activities Files; Audio-Visual Materials; Committee on Equal Educational Opportunities. Leonard also taught law course at the State Police Recruit School and Metropolitan Police Academy of Michigan.

Minutes, 1888-1919, including; correspondence, newspaper clippings, and scrapbooks concerning party affairs; also papers, 1929-1970, concerning Prohibition Party in Michigan; papers, 1918-1930, concerning prohibition in Great Britain; papers, 1951-1958, concerning the National Temperance and Prohibition Council; and minutes, 1872, of the State Central Committee of the Prohibition Party of Michigan; also photographs and films.

The Prohibition National Committee record group is arranged into the following series: Correspondence; Minutes and other papers; Press and printed; Sound recordings; Other organizations; and Visual materials. Except for the significant minute books of the party's national executive committee in the 1880s, most of the record group dates from the 20th century after the passage of the 18th Amendment. Information regarding the earliest years of the Prohibition Party in unfortunately missing in this record group.