Another item of importance is the maintenance of reserves clause. (choicemutual.com)
Curt Flood, angered at being traded from St. Louis to Philadelphia, unsuccessfully brought suit against baseball's reserve clause in 1970. (si.com)
The successful court case brought by Andy Messersmith the previous winter had essentially freed ballplayers from the yoke of the reserve clause, allowing them to sell their services on the open market when their contracts expired. (si.com)