A prison guard walks past a sign to the prison mosque inside Wandsworth prison. HMP Wandsworth in South West London was built in 1851 and is one of the largest prisons in Western Europe. It has a capacity of 1456 prisoners. (Photo by In Pictures Ltd./Corbis via Getty Images)
A prison guard walks past a sign to the prison mosque inside Wandsworth prison. Getty Images

UK Muslim prison gangs dubbed the ‘brotherhood’ fuel radicalisation fears