The Sidewalk Theory releases have some dark moments, but I believe Andrew and Jodie were inspired by stuff from Europe in the early and mid 90's, raw 909 and 303 tracks (and maybe some Goa).

There are labels like Acid Assault that are WAY darker than the tunes mentioned above.

Also the early Routemaster "Its always better to put a bullet into the back of the head - straight through to the bridge of the nose...."