It may have been a mystery at one time, but not 50 years later. The fingerprints of the Soviet intelligence service and its Cuban affiliate are all over Oswald. One of the main controversies covered superficially in the program was Oswald’s trip to Mexico City—a favorite place for foreign communist governments to contact communist agents living in the U.S. PBS claimed that Oswald visited the Soviet and Cuban embassies looking for a visa, but was rebuffed by communist officials. It said, “…in the end both the Russians and the Cubans rejected him. All his plans to fight for Castro and...