From a Mickey Mantle web site:

"Mickey worked at the Claridge Resort and Casino in Atlantic City as a greeter and community representative. Willie Mays held a similar position at another casino. By the letter of baseball law, any affiliation with gambling is grounds for being placed on the "permanently ineligible" list. (Pete Rose is currently on the permanently ineligible list.) Then Commissioner Bowie Kuhn warned Mickey before he accepted the position that he would have to place him on the list if he went to work there. Kuhn had already taken the same action against Willie Mays. Although he knew the consequences, Mickey accepted the position. He never bore a grudge against Kuhn for it, but he felt the rule was stupid. He spent almost no time in the gaming halls. Most of his activities were representing the Claridge in golf tournaments and other charity events. "I never did so much charity work in my life," was how he put it. When Peter Ueberroth became commissioner one of his first actions was to reinstate both Mantle and Mays. Ueberroth lifted the ban on both players March 18, 1985."