<P> Oscar DeGruy (born 1950) is an African - American actor who has appeared in over a dozen films and TV shows over 30 years, started the Bahá'í Youth Workshop performance model in 1974, and has assisted hip hop artists . </P> <P> DeGruy was a regular on The New Bill Cosby Show for the 1972 - 3 season and appeared in shows as diverse as Room 222 to Hill Street Blues . His first role was on The Young Lawyers in 1970 and in 2008 he completed work as a supporting actor in Zero Option based on a true story . </P> <P> In Good Times in 1974 Degruy was featured in a two - part episode "JJ and the Gang". JJ is forced into a gang led by Mad Dog (DeGruy) who wounds JJ . After the trial Mad Dog is confronted by his mother who confesses "I never thought I could feel this way about my child, but I hate you" and the two exchange emotional arguments over the missing husband / father . JJ's father, James, ultimately feels sympathy for Mad Dog witnessing the family argument over the absent father . </P> <P> A former member of the Black Panthers DeGruy changed his approach to racism issues and "had to do something" - so he and his wife brought performing arts theater with performance arts of step dance and street dancing together with the Bahá'í principles of equality, racial harmony and unity of religions . In 1982 DeGruy was joined by Juliet Soopikian and together they co-wrote the Workshops's manual in 1987 . In 1995 there were over 100 Workshops in the United States and another 100 scattered across 50 other countries . Over 1000 such Workshops have formed over the years some of which have toured internationally . </P>

The guy who played mad dog on good times
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