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Britain has blocked Cenk Uygur, a left-wing Turkish-American media personality, and his nephew, Hasan Piker, a U.S. left-wing commentator and influencer, from entering the country to speak at events, both said on Monday.
Uygur, who co-hosts the popular YouTube channel "The Young Turks", and Piker said they had been barred because of their views on Israel.
Britain's interior ministry said travel authorisation for "these individuals" had been cancelled as "their presence in the UK may not be conducive to the public good" in a statement that did not mention Israel.
They had been listed to speak at the SXSW London festival later this week, and at the University of Oxford this weekend.
"I've been banned for criticising Israel. Are we free anymore?" Uygur posted, after he said he tried to board a flight.
Piker said: "The UK has revoked my visa as well. All at the behest of Israel."
Piker had been due to speak at SXSW about "How the American Left Learned to Speak the Internet". Uygur's session was titled: "Techno-Feudalism is Here. Who Are the Lords?"
There was no mention of Israel in their sections on the website for SXSW London, which describes itself as a festival of "business, technology and creativity".
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