Robert Crumb (the comic creator of Fritz the Cat) completely disowned the movie. He absolutely hated it. In fact, he hated it so much he killed off the character and never spoke of him again.
I myself liked the movie, but now, many years later, I can see why Crumb hated it so much:
It depicted left-wing political activists as violent terrorists, who used mass murder and bloodshed to achieve their goals, one of them actually sporting a swastika.