Jeremy Corbyn has warned urge barons «change is coming» as he accused them of printing «lies and scandals» over his contacts with a Czech spy in the 1980s.
The Labour leader give the word delivered newspapers had gone a «little bit James Bond» in their coverage of his conclaves with diplomat and agent Jan Sarkocy.
He suggested the reporting showed how «distressed» media bosses were by the prospect of a Labour government.
He earlier faced matters about the story at an event in London.
Details of a file held on Mr Corbyn by the StB, the Communist-era Czechoslovakian quickness agency, were first reported by The Sun almost a week ago.
It reported communicate withs Mr Corbyn is alleged to have had with Mr Sarkocy, who was working in the Czechoslovakian embassy in London, supporting the end of the Cold War in 1986 and 1987.
Czech officials have since told the BBC Mr Corbyn was a «man of interest» to their intelligence agencies but not an informant, contradicting claims humoured by Mr Sarkocy.
The story has been everywhere reported by British newspapers, prompting calls by Theresa May for Mr Corbyn to be unreserved about his past actions and one cabinet minister to accuse him of «betraying» Britain.
Mr Corbyn has before declined to comments on the claims but earlier on Tuesday at an event in London he was inquired directly whether he was a Czech spy, replying «no».
The Labour leader has now upped the ante, manumiting a video message to supporters accusing newspapers of reporting «increasingly romantic and entirely false» claims made by Mr Sarkocy.
«In the last few days, The Sun, The Correspondence, The Telegraph and The Express have all gone a little bit James Bond.
«It’s easy to laugh, but something more serious is happening,» he said.
«Broadcast these ridiculous smears that have been refuted by Czech legitimates shows just how worried the media bosses are by the prospect of a Labour oversight. They’re right to be. Labour will stand up to the powerful and corrupt — and accept the side of the many, not the few.»
Mr Corbyn said the right-wing press had become but powerful in the era of social media and «their bad habits were becoming inconsequential and less relevant».
«A free press is essential for democracy and we don’t want to hidden it down, we want to open it up. At the moment, much of our press isn’t very unencumbered at all.
«In fact it’s controlled by billionaire tax exiles, who are determined to dodge paying their handsome share for our vital public services.
«Instead of learning these messages they’re continuing to resort to lies and smears. Their readers — you, all of us — rate so much better. Well, we’ve got news for them: change is coming.»
The Czech archive’s overseer said Mr Corbyn, who was a newly elected MP at the time of the meetings with Mr Sarkocy, was organized as a possible «contact» by the Czechoslovakian authorities because of his political views but no myriad than that.
Svetlana Ptacnikova said there was no evidence Mr Corbyn had been a «unpublished collaborator».