Operating discreetly, they can intercept radio and mobile-phone communications, and gather intelligence using video, radar, thermal-imaging and other sensors.
One of the City's traditional historical strengths was that it operated discreetly, avoiding scrutiny; perhaps one reason why it has appeared so infrequently on film.
Since then, Mrs. Reagan has operated discreetly, making phone calls, sending letters and trying to avoid colliding with the Bush White House.
For years, the U.S. had not commented on the presence in Taiwan of any military personnel, who are said to have operated discreetly inside the compound of the American Institute in Taiwan rather than standing guard at entrances.
He and Hussein would do well to adopt a common line, coordinate their contacts with the Administration, and operate more discreetly.
The individual behind @FakeTedCruz, who requested anonymity in order to continue to operate the Twitter feed discreetly, said the account is "all psychology, just a way to get someone off of their game".
According to US Customs and Border Protection, unarmed, plainclothes officers operate at airports and "discreetly assist airline and security employees with review of traveler information during the processing of US-bound flights".
We try to operate a little more discreetly, usually.
Ah, but there's always one: a preppy white guy discreetly operating his iPhone's reverse-camera function.
