Does Hizb-ut look big in this?

Two troubling tidbits of information in The Times today.

Shiraz Maher writes:

At universities across the country, Hizb ut-Tahrir operates freely behind a series of “front groups” holding events covertly and spreading its dangerous message of confrontation and separation. In recent years it has become more sophisticated in how it does this, circumventing attempts to clamp down on its activities.

Meanwhile, Sean O’Neill reports:

A senior figure in Hizb ut-Tahrir, a hardline Islamist group that the Government keeps “under continuous review” and the Conservatives want to ban, is teaching and preaching at a top university.

So who, one has to wonder, is enabling this? Is there simply a blind spot, or are the same sort of people who – in a previous era – muddied the waters enough for KGB agents to take up positions in the civil service, academia and the media now doing the same for the Islamists?