Ryan Vallan

Allan A. Ryan Jr. (July 3, 1945 – January 26, 2023) was an American attorney, author and a law professor at Harvard University, where he taught from 1985 until his death. He is best known for his work as a Justice Department lawyer who in the early 1980s identified and prosecuted dozens of Nazi collaborators living in the United States, earning him a reputation as America's foremost Nazi hunter.

Biography fallback source: Wikipedia