Listed here are many of the more significant warez groups, with a short introduction of when they were formed and what they have done. Note that there are many other warez groups that are not included here.
Centropy[edit]
Main article: Centropy
Centropy, founded in January 1999, was a warez group which specialized in the piracy of films. Touting many "0-day" and "negative day" releases, Centropy has released and pre-released numerous films.
Crackers In Action[edit]
Crackers In Action (also known as CIA),[1] founded in 2000 by tKC,[2] using IRC to communicate[3][4]
CLASS[edit]
Main article: CLASS (warez)
CLASS (also known as CLS) was a warez group which was the target of federal raids such as Operation Fastlink. They were a global group with members worldwide, often releasing "rip" games. The group ceased operations in 2004 after their 1,234'th release.[5]