For 10 points, name this African American center fielder for the Cardinals and Senators who in 1970 unsuccessfully challenged the MLB's reserve clause.
Robert M. Goldman's entry in the series Landmark Law Cases on this man examined similar cases such as Gardella v. Chandler which involved a man attempting to relocate to Mexico.  This man's lawyer, former Supreme Court justice Arthur Goldberg, argued that the opposing party had violated the Thirteenth Amendment.  Funding for his lawsuit was provided by union chief Marvin Miller.  This man declared "I just won't be treated as if I were an IBM card" and objected moving to "northernmost Southern city".  He wrote a letter to Bowie Kuhn demanding his freedom before suing Kuhn.  This man objected to working in a building named for (*) Connie Mack.  This man's case paved the way for the Seitz decision, which granted freedom to Dave McNally and another pitcher, Andy Messersmith.  For 10 points, name this African American center fielder for the Cardinals and Senators who in 1970 unsuccessfully challenged the MLB's reserve clause.
Robert M. Goldman's entry in the series Landmark Law Cases on this man examined similar cases such as Gardella v. Chandler which involved a man attempting to relocate to Mexico.  
Curt Flood [or Curtis Charles Flood]