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AAU Basketball took over the air waves of the sport about the dawn of the 21st century. Of course, AAU (Amateur Athletic Union) isn't the only travel league for basketball these days. There's the AYBT, the YBOA and so and so forth - but AAU is the foundation that gets the most attention, is the most renowned, and is also the most expensive when it comes to dolling out money (at every level from the players to the corporations).
This arises a very interesting point: There is so much money involved in AAU basketball that the whole "summer" sport becomes extremely political. Players are forced out, forced in, and paid to play. Nike, and the bigger players that run whole tournaments in places like Las Vegas doll out massive amounts of money to these AAU events because it offers great advertising. That means that they want the best players on the best teams, and there is a lot of lockout of other players.