Sunbeltblog has a good post on a group that helps “take bad guys out”. The Internet Crime Provention and Control Institute (Link expired). Basically, they will take submissions of complaints and assist in getting sites taken down. A good example would be phishing sites, maybe servers hosting illegal content, stolen information, etc. etc.
Or, perhaps a machine is spewing out viral, nigerian 419 scam or other material. That’s what the ICPCI is there to receive complaints on and coordinate “takedowns”. According to the sunbelt entry (a tip from a reader), they’re pretty effective at the takedowns (even when the site is hosted in places you would think makes it tougher.)