Alan Foster -- who cofounded the Big Baller Brand -- is dragging the Balls to court once again ... this time he's suing LaVar Ball, Tina Ball, LaMelo Ball as well as PUMA, alleging they screwed him out of hundreds of millions of dollars.
Foster's claims were spelled out in a new lawsuit filed in federal court in California earlier this week ... some four years after he had a falling out with the Ball family over the BBB business.