May 03 -- Union Communications Services, Inc.
Four striking workers are killed, at least 200 wounded, when police attack a demonstration on Chicago’s south side at the McCormick Harvesting Machine plant. The Haymarket Massacre is to take place the following day - 1886
(Attacks against strikers and the very existence of organized labor persist to this day. From Blackjacks to Briefcases is the first book to document the systematic and extensive use by American corporations of professional unionbusters, an ugly profession that surfaced after the Civil War and has grown bolder and more sophisticated with the passage of time.)
Eugene V. Debs and other leaders of the American Railway Union are jailed for six months for contempt of court in connection with Pullman railroad car strike - 1895
Pete Seeger, folksinger and union activist, born in Patterson, N.Y. Among his songs: “If I Had A Hammer” and “Turn, Turn, Turn” - 1919