2/3 of the world follow socialistic ideas in one form or the other ! Western societies are welfare Fabian states derived from socialism. Socialism as a theory has had the largest influence on human thoughts.
MOD Edit: Attack the message, not the messenger.
Ideas of socialism now common practically in entire countries ( free education, general medicine, equality of rights for men and women, rich and poor and other). Simply the USSR went on the way of reactionary socialism, and the West on the way of moderate).
Roosevelt was the most important socialist of America, although never him it did not acknowledge. Exactly his socialistic reforms, help out of the USA from Great Depression. Were therefore clear him in going the USSR of reforms and he appointed the ambassador of the USA in the USSR as the best friend Joseph Davis . And in general, Roosevelt would live even yet year - Cold war would not be!
Roosevelt str. in Yalta
And a communism is more developed form of society. He never was. The world did not grow to him.