On Windows, open c:\windows\system32\drivers\etc\hosts with notepad (make sure you are running notepad as an administrator). At the bottom of the existing file, copy and paste these lines:
91.211.98.20 fulltiltpoker.com
91.211.98.20 www.fulltiltpoker.com
77.87.179.116 pokerstars.com
77.87.179.116 www.pokerstars.com
66.212.231.205 www.ub.com
66.212.231.205 ub.com
Save the file, and reboot. That's it. You'll see the actual poker sites once again, not the FBI's communist page.