The Muslim preacher Shaykh Hamza Sodagar should be banned from the UK. It has been claimed he advocated that gay people should be killed:
You may be interested in these active petitions
https://www.independent.co.uk/news/uk/home-news/hamza-sodagar-us-muslim-preacher-who-advocated-beheading-of-gay-men-allowed-to-lecture-in-the-uk-a7348886.html