Not much different than wanting to fly the Nazi flag during WWII.
Simply treason.
Why is treason considered an outdated concept these days???
Because the people who have taken over our government, invaded out nation, and are preparing to install a socialist government made up of criminals from all over the world don't want to be bothered with a law like 'treason' (unless you are being treasonous to them).
Since they decide who laws apply to and who they don't, very few cases of treason have ever been tried.