“Even the signs they wear on marches/protests they attend on Shabbat, is not a clear violation of halacha, as arguably (yes not clear but arguably) it is a grey area as they are wearing them literally, but it isn�t really clothing, so it is unclear.”
Signs certainly aren’t clothing so the vile Nazi Kapos who pretend to be frum make up their own Hilchos Shabbos in the name of their fake god. They have nobody to ask since no reputable Posek wants anything to do with these insane quislings.