CEP Senior Advisor Ian Acheson writes: "Recent weekends have seen tens of thousands of protestors on the streets of London and elsewhere in a show of solidarity for Palestinians. The right of peaceful protest in this country is a precious one and a bulwark against tyranny. It also acts as a safety valve for emotions and opinions that might otherwise curdle into violence. But the opposite is also true. Protests in favour of Palestinian rights in Gaza and the miserable conditions its citizens endure have clearly been infiltrated by extremists who are exploiting police ineptitude to intimidate British Jews."