united states postal inspection service

English Thesaurus

1. the primary law enforcement arm of the United States Postal Service (noun.group)

hypernym	:	independent agency,
definition	:	an agency of the United States government that is created by an act of Congress and is independent of the executive departments (noun.group)

part meronym	:	united states postal service, us postal service, usps,
definition	:	an independent federal agency that provides mail processing and delivery service for individuals and businesses in the United States (noun.group)