March 13

 March 13
The term “rat,” referring to a worker who betrays fellow workers, first appears in print in the New York Daily Sentinel.  The newspaper was quoting a typesetter while reporting on replacement workers who had agreed to work for two-thirds of the going rate - 1830
 
A four-month UAW strike at General Motors ends with a new contract. The strikers were trying to make up for the lack of wage hikes during World War II - 1946