Cold War assassins had to be discreet. That's why KGB hit man Nikolai Khokhlov carried a gun disguised as a cigarette case. Read about this and other "Tools of the Trade." Click to launch.

For 30 years, Markus Wolf ran the international wing of East Germany's "Stasi" intelligence agency, one of the Cold War's most effective espionage operations. Here's the inside story of how he infiltrated the West.

At age 19 he joined the Manhattan Project and passed nuclear secrets to Moscow. Some say he cut eight years off the Soviet A-bomb program. Meet Ted Hall, and other "Master Spies." Click to launch.

Noted espionage expert H. Keith Melton explains how computers have changed the rules of the game.

Before there was Saddam Hussein, there was General Abdul Kassem. The CIA plot to kill him is among the Cold War espionage tales in "The Spy Files."

Like everything else, the world of espionage is becoming a part of the World Wide Web. Here's a quick guide.