WASHINGTON — It was the beginning of the night shift last Wednesday at the United States Mint in Philadelphia, a secure facility that manufactures money, when a white male coin maker strode across the factory floor to the workstation of an African-American colleague. He was carrying a piece of rope.

The rope had an official purpose: to seal coin bags once they were full. But the worker, who operates the machinery used to make coins, instead looped and twisted it into a hangman’s noose, according to Rhonda Sapp, president of the Mint workers’ union. She was soon deluged with calls and text messages from outraged employees…

Read more in The New York Times.