Ironically, I think the other side of that sign actually reads "No Parking -- Police Vehicles Only" -- it's probably also the only street sign without graffiti and/or stickers adorning its backside.
This mural commemorates the People's Park riots of May, 1969. This particular section represents the killing of James Rector -- an out-of-town observer -- by Alameda County Sheriff's Deputies, a.k.a "The Blue Meanies." The medics who took to the streets with first aid kits to treat the wounded later went on to help form the Berkeley Community Health Project (a.k.a. The Berkeley Free Clinic) where I was to later volunteer for several years, and which eventually lead to both of my current jobs.
I shot this over my shoulder out the car window while I was at the stoplight at that corner -- maybe the only place to get a clear shot.
Uncropped -- just one RGB curve, and two applications of USM at 88%/0.8 dia/TH=5; JPEG=6/10
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