I am looking for the author of a trilogy, possibly from the 80's or 90's. The "hero" is attacked early in the first novel by a gang that has genetically modified themselves to be like werewolves (or use some kind of electronic disguise). Next, he is contracted by aliens who are basically like 6' earthworms that live in a big hole that the hero needs to descend to visit. There is a creepy story in the second novel where he is captive and forced to kill people on an assembly line so the humans he works for can eat them. He gets in trouble because he comforts a young boy before killing him, thus tainting the taste because he didn't die in terror. Weird trilogy but I'd like to read them again.
I believe this is the "Emancipator" trilogy, by Ray Aldridge (The Pharaoh Contract, Emperor of Everything, and The Orpheus Machine), based on the scene you mention from the second book, where the protagonist is taken captive and forced to manually operate the human slaughterhouse. It's been so long since I read the series that I don't recognize the other scenes you mention, but they seem to fit with the overall feel.