Organisations can be proscribed under the Terrorism Act if they "commit or participate in acts of terrorism, prepare for, promote or encourage terrorism or are otherwise concerned in terrorism" or if they "unlawfully glorify the commission or preparation of acts of terrorism". But proscription is the easy option. A tougher one would require greater political will than we have seen hitherto. If there is evidence of direct terrorist involvement, then the organisers should be prosecuted: there are treason laws that can be used against British citizens who give "aid and comfort" to our enemies. At the very least, we should not be paying them benefits; and any member who is not a British subject should be deported. It is bizarre that we are proscribing organisations for their alleged connection to terrorist activity, yet allow those among their membership who are not British to stay in the country lest we infringe their human rights.