Fear

"The skillful, clever use of fear (not to mention hate) is the defining trait of leftists throughout history. Fear is the primitive emotion the left feeds on like a junkie needs drugs. It is a trait repeatedly manifested in history by the use of intimidation or bully-boy tactics to assert raw power. It is the vividly identifiable scarlet thread of intolerance that has shown itself in one leftist movement after another on down through the centuries, regardless of nationality."

Jeffrey Lord in American Spectator.

Very interesting read.