extremism
US /ɪkˈstriː.mɪ.zəm/
UK /ɪkˈstriː.mɪ.zəm/

1.
the holding of extreme political or religious views; fanaticism.
:
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The government is committed to combating all forms of extremism.
•
Religious extremism poses a threat to global peace.
the holding of extreme political or religious views; fanaticism.