I think Emma Goldman noted that every civil war is class war. In this instance, that really rings true. One of the characters in the film notes that 60% of the inmates in Attica were black and 0% of the guards were black. As for the higher-ups of Attica, well, I'll pick my guess at the quotas there.
The Attica riot was spectacular: the inmates took over and stood their ground for 22 days until riot police massacred a bunch of inmates and, actually, 10 of the hostages.
The film deals with the humane aspects of the take-over in a lot of ways. The legal people mainly think the inmates' demands are valid. The governor is slammed by demands from outsiders, seemingly mainly the people and the police unions. The dilemma is plain to see.
I really liked the fact that there's very little soundtrack here. The film ended abruptly, but that's due to the real chain of events. Recommendable because of the humanity.