In 1965 he became U.S. Solicitor General, a position which acted as a springboard to his most famous post in which he wrote notable dissenting opinions in San Antonio School District v. Rodriguez and 1978's Bakke case, clearly stating his support of affirmative action.  
His first major case was 1935's Murray v. Pearson, but more important was Shelley v. Kraemer in which he succeeded in abolishing "protective covenants."  In 1965 he became U.S. Solicitor General, a position which acted as a springboard to his most famous post in which he wrote notable dissenting opinions in San Antonio School District v. Rodriguez and 1978's Bakke case, clearly stating his support of affirmative action.  FTP, name this one-time NAACP lawyer who won Brown v Board of Education and became the first African-American to sit on the Supreme Court.
His first major case was 1935's Murray v. Pearson, but more important was Shelley v. Kraemer in which he succeeded in abolishing "protective covenants."  
Thurgood Marshall.