Australia's Islamic leaders have demanded radical group Hizb ut-Tahrir stop voicing its vile sermons in public, hate-filled messages which they claim are tarnishing the entire Muslim community.

The stinging rebuke comes as the religion's leaders prepare to intervene in the activist group in a last-ditch attempt to calm its members' aggressive and scandalous approach and curb its fundamentalism.

For years Australia's often divided coterie of imams have been loathe to publicly scold Hizb ut-Tahrir's tiny but vocal members, shaking their heads in private but preferring to preach freedom of expression.

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