They did hassle Edward James Olmos to the point he considered bailing LA. Rene was one of the Mexican Mafia members(alongside with 'Huero Shy' Shyrock and 'Pee Wee' Aguirre) who got the script of the movie beforehand and warned Olmos of possible issues coming up because of it. 'Pee Wee' Aguirre, who is one of the alleged shooters of 'Rocky' Luna, who, as I already mentioned, served as a consultant apparently tried to shake Olmos down for 150k.

And yeah. Joe Morgan in return tried to sue Olmos, however the lawsuit failed.