His tenure was marked by player boycotts and owner disenchantment and the end of baseball's reserve clause, yet baseball enjoyed unprecedented attendance and television contracts during the same time frame. Kuhn suspended numerous players for drug involvement and kept Willie Mays and Mickey Mantle out of baseball because they had worked for casinos. And in 1976 when the Oakland Athletics attempted to sell several players to the Boston Red Sox and New York Yankees for $3.5 million, Kuhn blocked the deals on the grounds that they would be bad for the game.