Colonel Stig Erik Constans Wennerström (22 August 1906 – 21 March 2006)[1] was a Swedish Air Force officer who was convicted of treason for espionage activities on behalf of the Soviet Union in 1964.

[4] During the 1950s, Wennerström leaked Swedish air defence plans and the entire Saab Draken fighter jet project to the Soviet Union.

As early as 1943, the Swedish Security Service (SÄPO), suspected that Wennerström was working for Germany and in 1947 there were indications that he had connections with the Soviet Union, but the suspicions couldn't be proven.

Sniper did not identify him, but did state that he had previously been a CIA agent and had served in Moscow as the Swedish Air Attaché.

During the six years prior to his arrest, Wennerström is believed to have handed over 20,000 pages of secret documents about the Swedish defences.

The documents contained information about the Swedish Air Force's strategy, secret military bases, and radar defense and mobilization plans.

[i] In 1972 the Swedish government commuted the sentence to 20 years, despite the Supreme Commander, General Stig Synnergren, still considering him to be a high security risk.

[11] One of his daughters, Christine, made headlines in 1957 when at the age of 16 she ran away to elope with her 18-year-old boyfriend, a Senate page named Huw Williams.

The couple was apprehended eighteen days later in Pennsylvania, US, having been denied in their effort to obtain a marriage license in several states, and in Canada.