Hastie served as a co-lead lawyer with Thurgood Marshall in the voting rights case of Smith v. Allwright, 321 U.S. 649 (1944) in which the Supreme Court ruled against white primaries.
Hastie collaborated with Thurgood Marshall as lead lawyers on the voting rights case Smith v. Allwright, 321 U.S. 649 (1944). The Supreme Court decided against white primaries in this case.