Either the people they betray lynch them or the people they are working for lynch them.
Gotta kill collaborators after they done being useful to you. Russian military rule no 7.
I really do not support the death penalty or lynching but for this I suppose, but only after the war has started the Canadian Criminal code does talk about treason.
Look I hate the USA and the majority of Americans just as much as the next guy, but for those saying those traitors should just move to there, they already have enough of those types of people. They should instead move to the North Pole or Antarctica if they love whiteness so much.