Originally Posted by wikipedia

One of the most famous uses of the term in popular culture was the ironic use by Charlie Daniels in his breakthrough 1972 hit "Uneasy Rider." The dope-running hippie narrator is stuck with a flat tire in Jackson, Mississippi. Attempting to avoid a beatdown by the locals, he attempts to deflect attention to one of the locals by accusing him of being "a friend of them long haired, hippy-type, pinko fags" sent by the FBI to infiltrate the Ku Klux Klan.