Order of Merlin
Albus Dumbledore - First class Newt Scamander - Second class Gilderoy Lockhart - Third class
"Though she shared Albus Dumbledore's fears and suspicions about Lord Voldemort, McGonagall did not join the Order of the Phoenix during the First Wizarding War (then seen as a renegade outfit by the Ministry). Instead, and unbeknownst to her students, she spent many nights spying for the Ministry in the guise of a tabby cat, bringing the Aurors crucial information on the activities of Voldemort's followers."