The stage invader who interrupted SuRie's performance in the Eurovision final is thought to be the anti-media campaigner known as Dr ACactivism.
The man previously stormed the stage during the final of the Voice in 2017 and the National Television Awards in January 2018.
He grabbed the microphone from Britain's Eurovision entrant on Saturday night, before shouting about the "Nazis of the UK media".
SuRie remained on stage and clapped along her to the music of her song Storm as the man was then dragged off stage by security
Dr ACactivism refers to himself on his website as a "philosopher, activist, DJ/MC" and an author of seven eBooks.
A post on his Twitter account from 10 May advertises his latest eBook called The Workings Of The UK State Mafia.
Hours before his Eurovision stage invasion he had posted a video on Twitter that claims to show a journalist grabbing his kneck.
Words across the video read: "Watch how journalists and Police of London use force to silence Independent Thinkers."
Dr ACactivism crashed the stage during the final of the Voice in April 2017, whilst holding up a piece of paper that was meant for viewers to read.
He was tackled by security before the audience had a chance to read the message.
Months later he tried to make it onto the stage at the National Television Awards while the nominees for the Bruce Forsyth Entertainment award were read out.
Dermot O'Leary was able to remove him from the stage without him making it on television.
Graham Norton, who was the commentator for the BBC coverage of Eurovision, said after SuRie's performance: "She was doing a brilliant job anyway."
He later added: "There was a stage invasion, SuRie coped incredibly well, I can't stress enough what a brilliant job she did, she must have been terrified."
The European Broadcasting Union offered SuRie the chance to perform again but she chose not to.
SuRie came 24th of the 26 entries in the contest.
The 29-year-old tweeted afterwards: "Well I've always said anything can happen at Eurovision."
She said: "I'm so proud of my performance tonight. I gave it my very best.
"It's been an incredible experience for me. I am so grateful for everyone's love and support.
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"The fans make Eurovision what it is; the biggest and the most inclusive and open celebration of music in the world."
The competition was won by Israel's Netta who sang her quirky dance number Toy.
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