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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.

Professor of law at University of Michigan, and specialist in corporation law. Correspondence, speeches, newspaper clippings, notes, and manuscripts of books and articles, relating to his professional career, Ann Arbor, Michigan organizations and issues, particularly progressive political movements and prohibition, including the Michigan Anti-Saloon League, the anti-trust movement, and the 1912 Progressive Party; also photographs.

The Horace L. Wilgus papers include correspondence, speeches, clippings, notes, manuscripts of books and articles dealing with his professional career, the many Ann Arbor organizations and issues in which he was interested: particularly progressive political movements and prohibition, including the Michigan Anti-Saloon League, the anti-trust movement, and the 1912 Progressive Party. The collection also includes University of Michigan Law School course materials, family genealogical information, and a small series of photographs, many of them of his home on Washtenaw Ave. in Ann Arbor, Michigan.