Dodgers beating suspect Marvin Norwood should know how to deal with his aggression -- because back in 2009, he completed a 52-WEEK domestic violence program, TMZ has learned.
As we previously reported, Norwood has a long rap sheet -- and was convicted on a spousal abuse charge in 2006 ... over fours years before he allegedly beat San Francisco Giants fan Bryan Stow within an inch of his life.
The judge in the 2006 case sentenced Norwood to 180 days in jail and ordered him to complete a domestic violence program. And according to court docs, he served at least 118 days ... and completed the program.
Norwood is now involved with another woman -- Dorene Sanchez -- who was also arrested in connection with the Stow beating.