The expression derives from a series of incidents from 1983 onward in which United States Postal Service (USPS) workers shot and killed managers, fellow workers, and members of the police or general public in acts of mass murder. Between 1986 and 1997, more than 40 people were gunned down by spree killers in at least 20 incidents of workplace rage.
Going Postal Goes Abroad – The Morning News
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