Trump Supporters and Communists

The blog comments by Trump supporters (you find a sample here) remind of the following story:

A Conservative Party candidate for public office in NYC was accused of being a fascist by a demonstrator. He replied “You have no more right to say I'm a fascist than I have the right to say you're a Communist.” The demonstrator then said “But I am a Communist!”

If I recall correctly, that was in National Review but I can't find it online.