I've looked into this too. There are certainly threatening comments on twitter, but these get labelled as "By Gamergate" without any kind of awareness of the association fallacy. A threatening comment is always the responsibility of the individual. There are threatening comments all over social media, and anyone can be a victim of it. The media have been parroting this online harassment as fact without distinguishing it from criticism or just rudeness, and also without any acknowledgement of the same harassment on the other side. Active Gamergate supporters seem to vastly outnumber the anti Gamergate crowd by an order of magnitude, so I wonder if that makes it seem worse.
After 5 months of "GamerGate" there's been no arrests, no serious evidence of any imminent threat published or connection to any organized "harassment" campaign. Gamergate supporters themselves have been harassed, swatted, sent malicious objects in the mail and this is largely ignored in the media. Possibly because many of them took a different approach, and didn't kick up that much of a fuss about it, or perhaps because it doesn't fit the media's narrative.
This is my personal experience only, but the vast majority of gamergate supporters I spoke to were laid back, intelligent, friendly, and positive. There was the same ratio of weird but nice people that you'd find in any group really. However, many of Zoe Quinn's supporters ranged from being rude to abusive to authoritarian. They had an air of mocking superiority that gets old really quickly, and why I stay away from twitter.