The Anonymous hacker collective has released an internal document that gives an exclusive insight into three 2012 hacking campaigns designed to "punish" the world's "wicked".

Recalling police raids on Occupy Wall Street and Los Angeles camp sites, Anonymous blames the mayors of 18 US mayor cities for "the indiscriminate and unprovoked arrest and brutalistion of thousands of protesters".

On New Year's Eve, the collective launched "Operation Hiroshima", aimed at releasing as much "incriminating" information as possible on a seemingly random list of targets. As well as the personal addresses, emails and passwords of high-profile politicians such as New York's mayor Michael Bloomberg, the release also contained data reportedly taken from the FBI and the New York and Oakland police departments.

Anonymous has explained the move as a coordinated attack on the "protectors of property and purveyors of social control". The police's treatment of Occupy protesters is cited as the key motivation for the attack.

"While we attacked the institutions of capitalism, it would only make sense to attack those who enforce it, the inherently oppressive protectors of property and purveyors of social control; the pigs, the fuzz... the police," reads the document.

Top police officers around the US saw their email and Facebook accounts hacked, as well as their private documents, and published on online sharing services such as Bit Torrent.

Following on from Operation Hiroshima and the "LulzXmas" attack on security firm Stratfor, Anonymous revealed its involvement in a new "Project Mayhem" on 30 December.

Two key attacks on the California Statewide Law Enforcement Association (CSLEA) and New York State Association of Chiefs of Police have been confirmed by the AnonymousIRC Twitter feed. "Double wham bam: #AntiSec hacks, dumps CA & NY law enforcement emails" read AnonymousIRC's tweet.

The names, home addresses, passwords and personal email logs of over 300 police chiefs have been released.

The New Year's Eve hacker operation included also a virtual assault on the police's equipment supply store,

"Truth be told, we had been keeping quiet about this particular target for a time while we lived large off its pillaged goods," explains the statement.

"However, just prior to this release, a former member leaked the cleartext password lists, and some media picked up on it. Now that the jig is up, the full story of this owning can be told."

The projects are part of Anonymous' ongoing Operation Anti-Security campaign. In it the collective promised to mount a series of cyber-attacks on multiple law enforcement agencies.