Publishers are always looking to refresh the backlist of authors and sell more copies. In the 70's the beautiful painted book covers went out of fashion and photo covers came into vogue. The UK publisher Fontana had paperback rights to many of the well known thriller writers of the time like Desmond Bagley, Alastair Maclean, …
The History of the Espionage Act – Spy History of the Week
Women Suffragists who were nearly prosecuted under the Espionage Act in 1917 when they protested Woodrow Wilson in front of the White House.
Spy Ship USS Pueblo Crew – Spy Image of the Week
In January of 1968 the crew of the USS Pueblo were captured off the coast of North Korea and accused of spying. The US finally secured their release in December of that year. Full story at Wikipedia. A interesting video of a visit to the ship, still held by North Korea, is at VICE TV.