Here is the letter he wrote to Baseball Commissioner Bowie Kuhn (from Wikipedia):
- December 24, 1969
- After twelve years in the major leagues, I do not feel I am a piece of property to be bought and sold irrespective of my wishes. I believe that any system which produces that result violates my basic rights as a citizen and is inconsistent with the laws of the United States and of the several States.
- It is my desire to play baseball in 1970, and I am capable of playing. I have received a contract offer from the Philadelphia club, but I believe I have the right to consider offers from other clubs before making any decision. I, therefore, request that you make known to all Major League clubs my feelings in this matter, and advise them of my availability for the 1970 season.