If the countries themselves were not communist dictatorships, at least the architects that led the efforts were influenced by communist and authoritarian ideologies.

At least in Brazil, the biggest name in Brutalism, Oscar Niemeyer, who brought us atrocities such as the Metropolitan Cathedral of Rio de Janeiro [1] and the whole shitstorm called Brasilia, has always been an avid communist.

[1] https://en.wikipedia.org/wiki/Rio_de_Janeiro_Cathedral#/medi...