Recently, a senior leader of the Lebanon-based radical group Hezbollah was allowed into Britain. The US views it as a terrorist organization.
Another group that could be targeted is Hizb-ut-Tahrir, led until nine years ago by Bakri Mohammed, who was ousted for being too extreme. It is banned in Germany but denies support for violence
"They are moving to blur the margin between political Islam and violence," said Imran Waheed, spokesman for the group.
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