To what office did president Benjamin Harrison appoint Frederick Douglass to?

President Benjamin Harrison appointed Frederick Douglass as the United States Marshal for the District of Columbia in 1891. This position made Douglass the first African American to hold a federal office. His appointment was significant not only for Douglass's career but also for the representation of African Americans in government during that era. Douglass served in this role until 1893, contributing to the advancement of civil rights and social justice.