Critics say the government isn’t doing enough to inform the public about such secretive surveillance.

A new website that published leaked emails from several leading proponents of Britain's exit from the European Union is tied to Russian hackers, according to a Google cybersecurity official and the former head of UK foreign intelligence.

Russians using smart TVs reported seeing something atypical: A message appeared instead of the usual listing of channels. “The blood of thousands of Ukrainians and hundreds of murdered children is on your hands,” read the message that took over their screens. “TV and the authorities are lying. No to war.”

Critics say the government isn’t doing enough to inform the public about such secretive surveillance.

A new website that published leaked emails from several leading proponents of Britain's exit from the European Union is tied to Russian hackers, according to a Google cybersecurity official and the former head of UK foreign intelligence.

Russians using smart TVs reported seeing something atypical: A message appeared instead of the usual listing of channels. “The blood of thousands of Ukrainians and hundreds of murdered children is on your hands,” read the message that took over their screens. “TV and the authorities are lying. No to war.”