On Wednesday, a U.S. spy described by President Obama as one of the most important intelligence assets ever in Cuba was released. The spy, whose identity is unknown, helped break up multiple Cuban espionage operations inside the U.S. The agent was exchanged in return for three Cuban spies who had been held in the U.S. for over 15 years. The spy, a native of Cuba who has not been publicly identified, was a major priority for the intelligence community as part of any deal with the Cubans. Senior Obama administration officials clarified that the release of Alan Gross was not part of the prisoner swap with Cuba announced Wednesday.