FWIW, there's also a documentary by this same name about the West Memphis Three. WM3 are some teenage kids - wrongly, IMO - convicted of the murder of three children and imprisoned in Memphis back in 1993.
There are a few sequels to it, so I keep thinking that's what this is referring to - several recording artists, including Eddie Vedder, Johnny Depp, Ozzy Osbourne, et al, have done benefits for the WM3.
More info:
www.wm3.org. There are new hearings scheduled soon regarding information that wasn't available in 1993, as DNA tests still cost a million dollars back then.