Obstruction of Commerce & the Mail
“Neither snow nor rain nor heat nor gloom of night (nor Pullman Strike) stays these couriers from the swift completion of their appointed rounds.” This (slightly altered) saying, an inscription found on the General Post Office in New York City, is widely regarded as the motto of the U.S. Postal Service. It is not, at least not officially, but you get the drift: nothing will be allowed to prevent delivery of the U.S. mail.