The Big3, a three-on-three basketball league featuring former NBA stars and co-owned by rapper and actor Ice Cube, is suing Quinn Emanuel Urquhart & Sullivan for allegedly putting its lucrative relationship with the Republic of Qatar ahead of its far-less remunerative arrangement with the fledgling sports project.

In a state court complaint filed in Manhattan on Thursday, Big3 contends that Quinn Emanuel inserted itself into litigation between the league and former commissioner Roger Mason, whom the league believed had aligned himself with Qatari agents seeking to gain control of the asset.