Protest Suppression Quotes
The State Police then attacked the demonstrators with night sticks, bull whips and tear gas. The demonstrators were trying to cross the bridge to Montgomery. There was no legal Constitutional way that the marchers could be stopped, but the Alabama State Police then constantly violated the law.
They almost certainly did when they put down some protests / demonstrations during the Arab Spring. Sophisticated allies point out that the United States (Ohio National Guard) troops that killed the peaceful anti-Vietnam War protesters did so with American made weapons.