Planting microphones. Warrantless wiretapping. Breaking and entering. To generations of G-Men, these were known as "black bag jobs"—illegal acts ordered in the name of national security by officials at the highest rungs of the FBI.—Army Times, February 2012
He said he shared Newey's passion for counter-espionage and that he was familiar with black bag operations.—Chicago Reader, 13 Apr. 2001
Word History
Etymology
from the stereotypical black bag carried on such an operation
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