His position gave him knowledge of Soviet espionage activities in the West.

In 2008, Chi was sentenced to a 24 and 1/2 year prison term for his espionage activities.

We have evidence, far more evidence than you may realize, of your espionage activities.

For security warrants, there had to be evidence of major subversive or espionage activity.

Being American, he was able to go about his espionage activities without causing suspicion.

However, she was convicted based on evidence of her espionage activities found in her apartment.

She was aware of his espionage activities and condoned them.

His espionage activities were discovered, and he had to flee to Poland.

Two people were arrested in 1997 and four in 1998 for espionage activities.

"None of them have been observed engaging in espionage activities either."