LONDON — A radical Islamist preacher convicted in 2016 of inspiring support for the Islamic State and described by a British prison official as “genuinely dangerous” to public safety has been released from jail under strict controls on his travels and use of the internet.

The preacher, Anjem Choudary, 51, was released on Friday from the Belmarsh high-security jail in London and moved to a probation hostel, also in the capital, where he will spend at least six months.

Earlier in the week, he was moved to the jail after being freed from the maximum-security Frankland Prison in the northeast on automatic parole. He had served half of his five-and-a-half year sentence for inspiring Britons to join the Islamic State terrorist group, a former counterterrorism detective familiar with the arrangement told The New York Times.

“No other British citizen has had so much influence over so many terrorists as Choudary — we’ve tracked over 120 Islamist terrorists linked to him — and his release is likely to turbocharge an already-energized far right,” Nick Lowles, the chief executive of the British anti-racist watchdog group Hope Not Hate, said in a statement.