In 1963, Stig Wennerström was arrested after spying for Sweden on behalf of the Soviet Union for ten years.
The colonel had worked as an air attaché in Washington, among other places, and sold a wealth of information about the Swedish Air Force.
In 1964, Wennerström was sentenced to life imprisonment for gross espionage on behalf of the Soviet Union.
The sentence was later commuted to 20 years of penal servitude, and he was pardoned in 1974. In 2006, Wennerström died at the age of 99.
Fifteen years after Wennerström was convicted, it was time for the next big Swedish spy deal.
This time it was Stig Bergling who worked for Säpo.
He had been selling secret material to the Soviet Union since 1973.
Bergling was sentenced in 1979 to life in prison for aggravated espionage.
Eight years later, he manages to escape during a leave of absence and lived for several years with his wife in Russia, among other places.
In 1994, he returned voluntarily to Sweden for health reasons where he continued to serve his sentence until he was released on parole in 1997.
In 2015, Stig Bergling died at the age of 77.