A report also found radical ideologies are embraced by people who feel marginalised as they appear to offer an explanation for, or an answer to, a sense of grievance or lack of opportunity.
The report for the Commons All-Party Parliamentary Group Against Anti-semitism, warns extremism and integration cannot be tackled at a local level alone.
It also says they cannot be addressed in isolation from tackling inequality. The report calls for MPs to implement a national strategy. Co-editor Professor David Feldman of Birkbeck, London University, said: 'Xenophobia, Islamophobia and antisemitism are promoted by leaders to drive many forms of extremism."