Criminal investigations operate under far more stringent restrictions than counterintelligence operations.

That action came after a counterintelligence operation in Europe photographed him in the company of a known Soviet agent.

It would take a very clever counterintelligence operation to hurt Nomuri now.

As domestic spying and counterintelligence operations expanded under the Nixon Administration, it seemed, at times, that our government was at war with its own people.

It wasn't all that unusual for the Bureau, which ran most of America's counterintelligence operations.

That was, indeed, the ideal post for an intelligence agent, since with the job came access to everything, plus foreknowledge of any counterintelligence operations under way.

As with most counterintelligence operations, the really hard part was getting the first break.

"The campaign is not set up to run a whole counterintelligence operation - on ourselves anyway," he said.

Now they want us to give them the greatest secret of our counterintelligence operation.

From 1973 to 1980, he headed the Soviet Union's counterintelligence operations.