Reliapundit says it perfectly:
BBC: [British born] Islamist radicals who express support for terrorism may face treason charges, the Attorney General’s Office has said. Lord Goldsmith and the Director of Public Prosecutions Ken Macdonald have discussed action against three individuals, a spokeswoman said. The Crown Prosecution Service’s head of anti-terrorism will meet Scotland Yard officers in the next few days.
We here in the USA need the same laws and the same powers; we should be deporting foreigners who incite jihad, and charging Americans who do so with TREASON.