Stephen Joseph Ratkai is a Hungarian-Canadian who was arrested, charged and convicted of espionage in Newfoundland in February 1989. Recruited by Soviet Intelligence to become a courier for information at the US Naval Station in Argentia, Newfoundland, he was caught in a sting operation and was arrested after receiving documents from a U.S. Navy double agent. He pleaded guilty to charges of espionage and was sentenced to 9 years in prison.
(From: https://en.wikipedia.org/wiki/Stephen_Joseph_Ratkai)