Answer: In 1894 during Cleveland’s administration, the Pullman Railroad Strike occurred which resulted in military action by federal troops.
Explanation: The Pullman Strike had a significant impact throughout the West as it halted rail service, affecting nearly 27 states as well as territories. It all began against the Pullman Company because of low wages and 12-hours workdays, and also sympathy strikes led by Eugene Debs (Union leader of American Railway). Following a recommendation by Attorney General Olney, Cleveland sent federal troops to Chicago which eventually broke the strike. He became extremely unpopular with organized labor because of this action.