Who was the traitor in Star Wars?

During the Battle of Umbara, Jedi General Pong Krell was revealed to be a traitor to the Galactic Republic, having deliberately attempted to get as many of the clone troopers under his command as possible killed in an attempt to become the Sith apprentice of Count Dooku.

WHO calls Finn a traitor?

FN-2199 was physically portrayed by veteran stuntman Liang Yang, while his voice was provided by David Acord, a sound editor for Skywalker Sound. His scene in the film, where he shouts “Traitor!” at Finn, led to him quickly becoming an internet sensation shortly after its release.