Inside PayPal's hi-tech control room
18 December 2010 Last updated at 13:51 GMT
As Wikileaks founder Julian Assange prepares to defend himself in court his supporters say they will continue to target companies that cut links with his website.
Last week several big firms including Visa and Mastercard were subjected to cyber attacks because they withheld services and funds from Wikileaks.
The BBC has been given rare access to one internet firm that came under attack.
Rajesh Mirchandani took a look inside PayPal's hi-tech hub in Silicon Valley, California.