Posts from the International Association of Computer Investigative Specialists's private discussion list were included in the 38,000 e-mails.
The release is a part of Operation Antisec, a joint effort between Anonymous and LulzSec, in response to investigations concerning Occupy Wall Street and general censorship of the Internet.
Shortly after the release, the group wrote, "You want to keep mass arresting and brutalizing the 99%? We'll have to keep owning your boxes and torrenting your mail spools, plastering your personal information all over teh internets [sic]."
Antisec also released a video, detailing their mission (note: contains some explicit language).