In an article on the Atlanta Hawks website, Jon Newberry tells the story of how one of the greatest players in basketball history almost played for Atlanta.
In the summer of 1972, Dr. J was looking to make a move to the NBA from the Virginia Squires of the American Basketball Association (ABA) and the Hawks were looking to facilitate that move. This is where the problems begin.
In a nutshell, Dr. J secretly signed a contract with Atlanta but was drafted by the Milwaukee Bucks that same summer. A legal battle ensued which eventually barred Dr. J from playing for any team but the Virginia Squires.
— Reported by CSN Philly. The full NBA.com report is here.