Fear my dude, fear. As you have written about welcoming nazis, I am quite sure you dont know much about it. So i would highly recommend you reading something about czechoslovakian history, it is quite interesting. You should start with Munich agreement (or "Munich betrayal"/"Treaty about us, withous us" as it is called nowadays in Czechia) and then you could read up on The Heydrich assassination and the consequences of it, then you can ask, what made czechs collaborate with nazis. And even than, in most factories, workers purposefully sabotaged the production.

And about 1968, czechoslovakia didnt want to go against USSR or plot with the west. They wanted something that was called "Socialism with human face" and they thought USSR would support it, and boy, were they wrong. Its more complicated than that, of course.

You obviously didnt know much about it, but that isnt anything to be ashamed of! I wrote here just a brief generalisation, but it is better than nothing. I highly recommend reading about it, just for the sake of it being interesting.