I watched this documentary made by Danny Williams niece yesterday. Williams had a strange experience in The Factory with Andy Warhol. It's obvious their was some kind of power/affection struggle amongst Factory inhabitants. I suggest you watch this film it's on instant watch on Netflix and it's called "A Walk into the Sea".
From You Tube:
A brief excerpt from the film "A Walk Into The Sea," a doc about Andy Warhol's 1964-66 protege/strobe show light designer Danny Williams. Danny did all the strobes for the Velvet Underground.