Oscar De La Hoya says "REAL" boxing promoters don't tamper with other fighters -- and says, if Floyd Mayweather wants to set up a fight with Ryan Garcia, he's gotta do it the PROPER way.
Oscar -- who runs Golden Boy Promotions -- sent a cease and desist letter to Floyd after Mayweather made a fight offer to Garcia during an interview with TMZ Sports earlier this month.
In the TMZ Sports video, Mayweather looked in the camera and told Garcia -- a Golden Boy fighter -- that if he'd offer $200k for Ryan to fight Mayweather Promotions fighter Rolando Romero.