While war involves uniformed soldiers shooting each other and airplanes dropping bombs, it also involves multiple networks of people behind the scenes, gathering information right under the enemy's nose, as spies. Some even worked to undermine their own governments when the price was right, or when they believed their own government must be defeated. Many lost their lives doing this work, while some escaped by the skin of their teeth, and others were never found out. In this roundup from Weird History, we learn about nine World War II spies who did audacious things to further one side or the other, including a major league baseball player who was more satisfied with his second career than his first.