Dan Cleaves, pictured, frequents bars in the Fan and Shockoe Bottom (though supposedly he has been banned at most of the establishments in the Bottom) seeking out intoxicated women to rape. He has also stalked women, and targets transwomen especially. The provided number, 1-800-838-8238, will connect you to the Virginia Family Violence & Sexual Assault Hotline.
If you recognize him at a bar, approach the bartender or manager. They can confirm his identity by looking at his ID, and may throw him out as a result of his reputation.
I have corroborated this information with relevant sources.