May 4, 1886, Haymarket affair, started with 1 May protests for 8-hour day, a May 4 protest in Chicago against police brutality against striking workers that saw a bombing and the police firing into a crowd, the execution of 4 anarchists, and ultimately May Day as the International Workers’ Day, ironically not much celebrated in the US despite its “birth” there
May 4, 1970, Kent State Massacre, when National Guard opens fire on students demonstrating against the US expansion of the Vietnam War into Cambodia.
On the plus side, Pete Seeger was born May 3, 1919.
May the Fourth, when a plucky antifa force successfully eliminated an oversized weapon of mass destruction.
1961 - The Freedom Riders launched their first ride to the south, making it as far as Birmingham.
1994 - Israel and the PLO signed the Cairo Accords, granting the Palestinians self-rule in Gaza and Jericho.