The Federal Bureau of Investigation has executed over 40 search warrants for those involved with Operation Payback. Operation Payback was a group of hackers that took down the Visa, Mastercard, and PayPal websites using DDoS attacks out of Wikileaks retaliation. Visa, Mastercard, and PayPal had dropped financial support for Wikileaks founder Julian Assange shortly after he released confidential government cables. The group behind Operation Payback is known as “Anonymous.”