An FBI agent named Strasser. Perfect. Wiki: Otto Strasser, together with his brother Gregor Strasser, was a leading member of the party’s left-wing fraction, and broke from the party due to disputes with the dominant “Hitlerite” faction. He formed the Black Front, a group intended to split the Nazi Party and take it from the grasp of Hitler. This group also functioned during his exile and World War II as a secret opposition group.
His brand of Nazism is now known as Strasserism.
I wouldn't be surprised if some of them were paperclipped after the war to help organize the CIA and this agent is a grandson of same.