Richard Tomlinson has already served a short prison term for violating Britain's official secrets laws by trying to publish a book on his life as a spy.
Now he's been accused of blowing the cover of more than 100 British agents from New York to Nairobi to Phnom Penh by publishing a list of them on the Internet -- to get even.
Tomlinson, who was fired, claims pressure applied by the British has kept him from being able to begin a life elsewhere. He threatened to get back by blowing the cover of its agents.
The Web site was quickly removed at Britain's request by the California company that provided it, and the British have said many of the names on the list are not intelligence agents at all. But those who are had already been compromised.
"Nevertheless the release of the list -- however inaccurate it may be -- is a deeply irresponsible and dangerous act, " said British Foreign Secretary Robin Cook.
Dangerous particularly, for those agents who may now be involved in the war in the Balkans.
"I don't think it's impossible that these agents and officers might be operating in Belgrade. How do they know? When the names were available to whoever's revealed, they might not have been there, but they could well be in enemy territory," said Phillip Knightley the author of The History of Intelligence Agencies.
The Internet is now full of the chatter of disappointed people trying to find the forbidden list. With Richard Tomlinson's Web site closed, it's not easy. But a partial list of names can still be found if you look hard enough. In the information free-for-all that is the Internet, intelligence agencies no longer have a monopoly on information
Tomlinson, 35, who now lives in Geneva, Swtizerland, was jailed for six months in Britain in late 1997 after he showed the synopsis of a book on his career to an Australian publisher. He was fired from the service in 1995.
During his four-year career as a British agent, he served in Moscow and Bosnia.
Duncan Campbell, an investigative journalist who said he has been in contact with Tomlinson, said the former agent was now threatening to publish worldwide addresses of British agents.
Tomlinson is considered a renegade spy and believes the death of Princess Diana was a setup, as well as the crash of Swiss Air flight 111.