Task: Text Categorization
Input (English): One side in this event was headquartered at the Bost Building. Sheriff William McCleary attempted to mediate this event, which ended after Governor Robert Pattison called in the National Guard. It began after an agreement reached three years earlier with Charles M. Schwab expired. During it, the leader of one side survived a failed assassination attempt by Alexander (*) Berkman. It also saw a bloody clash after 300 agents traveled on a flotilla of barges down the Ohio River to confront workers. Plant manager Henry Clay Frick sent in Pinkerton detectives during this event, which involved union members from the Amalgamated Association. For 10 points, name this 1892 strike that took place at a Pittsburgh-area steel plant.
Output (English): History