65 ILCS 5/1-8-1

The corporate authorities of each municipality may provide for joining the municipality in membership in the Illinois Municipal League, an unincorporated, nonprofit, nonpolitical association of Illinois cities, villages and incorporated towns and may provide for the payment of annual membership dues and fees. The member cities, villages and incorporated towns acting by, through and in the name of such instrumentality may provide and disseminate information and research services, and may do all other acts for the purpose of improving local government.