Who are the biggest traitors?

Answer 1

The biggest traitors are those who betray their own beliefs. So "who is the biggest traitor?" would depend on your point of view.

Notoriously Vidkun Quisling became a byword for treachery when he sold Norway to the Nazis. As a fascist he would not have thought of himself as a traitor at all.

however Judas is widely known as the biggest traitor. Maybe Brutus.

Answer 2

1) Benedict Arnold: he sent spy messages to the British during the American Revolution, often using codes.

2) John Wilkes Booth: shot Abraham Lincoln at Ford's Theater.

3) John Dillinger: an infamous bank robber and murderer