The Iron Guard as I understand it was an entirely homegrown and popular fascist movement in Romania which in the early days of WW2 was brought into government but then quashed by the assassination of its leadership and broken up through use of extra-judicial arrests by the Romanian government.
Romania seems to have brutally managed to avoid crossing that "very thick line" but the Iron Guard had a lot of support and could have taken over.
The line is actually razor thin as can be seen repeatedly in countries worldwide (I lived under a military dictatorship in Latin America in the 1970s and almost lost my father to a shakedown by soldiers on a roadside).
Sadly the populace can and will support totalitarianism given the right circumstances.