Bill MillsBill Mills writes about twentieth-century clandestine operations and espionage history. He is the author of The League: The True Story of Average Americans on the Hunt for World War I Spies, Treacherous Passage: Germany’s Secret Plot Agains the United States in Mexico during World War I, and The Estrada Plot: How the FBI Captured a Secret Army and Stopped the Invasion of Mexico. He lives in Concord, MA. Read More Read Less