He's a left-wing domestic terrorist who likes to threaten bloggers.

And, recently he's issued threats that have caused the great blogger R.S. McCain to pack up and move his family out of his house. He's now blogging from an undisclosed location.

So who is Brett Kimberlin?

We're not going to pretend that we can do a better job of exposing this jackass for who he really is than Tiffany Gabbay over at The Blaze, so we'll just link to her exhaustive article about him, which will provide you with all the nauseating information that you need.