Hackers group Anonymous, which has been working diligently in support of WikiLeaks, claims to have acquired information for numerous MasterCard credit cards following its attack on MasterCard's website."To people of the industrial world, dismiss your #Mastercard now!!!" the group's Twitter account posted, with a link to alleged leaked credit card numbers, before the account was shut down by Twitter.A seemingly related campaign called Operation Bank-Troll is quickly gaining momentum on the Web.