This mural is part of the BAM (Bay Area Mural) Festival where 13 muralist painted murals in Oakland/Berkeley in October. See location of other murals http://bamfest.org/home
The BPP founded in 1966 in Oakland was active until 1982. They were a very controversial group that had community and social programs in several large cities and monitored police behavior and police brutality.
Statement from artist website.