The Government’s adviser on social cohesion has revealed she has spoken to the teacher in Batley who was forced into hiding as a result of abuse and threats, calling for ministers to do more to tackle “freedom restricting harassment”. Dame Sara Khan, who authored a report into extremism, warned that rising hate crime could “erode our freedoms”. The Khan Review warned that towns and cities across Britain are “struggling” to deal with extremism being whipped up by Islamists and the far Right. It concluded that in some areas there is “no infrastructure in place” to tackle conspiracy theories, dis…