Which prime minister strongly opposed communism?

Winston Churchill is probably the m ost known Prime Minister to oppose communism. Here are but a few quotes from Churchill about communism:

A communist is like a crocodile: when it opens its mouth you cannot tell whether it is trying to smile or preparing to eat you up.

From Stettin in the Baltic to Trieste in the Adriatic, an iron curtain has descended across the Continent.

Bolshevism is not a policy; it is a disease.

The day will come when it will be recognized without doubt throughout the civilized world that the strangling of Bolshevism at birth would have been an untold blessing to the human race.