Since people are talking about Kent State, Ohio, 1970, it's a good time to talk about Jackson State, Mississippi, 1970.
Similar situation, except there was no active protest, just a bunch of students hanging out. The mayor of Jackson declared a riot and called in the pigs. Someone threw a glass bottle, not at the pigs, but they still opened fire. Phillip Gibbs, a student at Jackson State, and James Green, a high school student who was walking home from his job, were murdered by cops. Many others were wounded.
Left: photo of James Earl Green, age 17
Right: photo of Phillip Gibbs with his wife, Dale