Frequenters of infamous U.S.-based website 4chan.org have declared war on Hollywood.
Its users led the charge in a distributed denial of service attack on the MPAA and RIAA websites Monday — blocking their pages for hours.
The move, say the anonymous attackers, was in retaliation to action the orgs have taken to squash filesharing sites such as Pirate Bay.
If you had trouble accessing the Web sites 
for the MPAA and RIAA earlier today, you’ve got 4chan to blame.
The infamous Internet imageboard (and hangout of film piracy advocates) launched a coordinated DDoS (distributed denial-of-service) attack on the industry sites Monday – allegedly in a retaliatory move for the trades’ moves to squash filesharing Websites.
Chris Morris: Journalist 