They didn’t need to disperse around the world. Every country had their own homebrewn flavour of Nazis. It’s just that during and shortly after the war they kept quiet, because they new they would be unpopular due to the association. Now that their aren’t many people left who have experienced the atrocities first hand and most people have become indifferent to the Nazis, they just started to become more public.
Pfizer did not buy BioNtech. They just got a production licence.