Haymarket amd Kemt State

May 4th (May the Force be with you) is the anniversary of both Haymarket
and Kent State. May 1, May Day, International Workers Day, actually
commemorates the events that led up to trial of the Haymarket 8 in 1886.
The rest of the world celebrates Labor Day commemorating this event in
Chicago.

The Wikipedia articles says there are two alternate theories as to why
the celebration of labor in the United States is the first Monday in
September, both of which were suggested in 1882, before Haymarket.
Making it a federal holiday happened after the Pullman strike in 1894,
also in Chicago.

Kent State was 1970, in which multiple students and anti-war protestors
were shot by the Ohio National Guard. 4 died, 9 wounded