The term 'League Leader' can refer to three different people. George BUSH, the 41st President of the United States, is a four-letter solution to this crossword. The IVY League is an athletic conference composed of eight private universities in the Northeastern United States, and its three-letter solution is 'IVY'. Finally, an All-Star is an athlete who has been selected to participate in an All-Star game, and its seven-letter solution is 'ALLSTAR'.