The Brexit Party leader cried foul after voters were urged to back Boris Johnson by the trio - Commons leader Jacob Rees-Mogg's sister Annunziata, Lance Forman and Lucy Harris.
Also urging voters to back the Tories in the video was MEP John Longworth, the ex-British Chambers of Commerce chief who was stripped of the Brexit Party whip on Wednesday for criticising its election strategy.
Annunziata Rees-Mogg, the Brexit Party MEP for Stamford, Bourne and Rutland has quit her party today.
They encouraged Brexit Party supporters to now switch their votes to PM Boris Johnson's Conservatives.
But their letter also said "we believe the current Brexit Party strategy runs the risk of the United Kingdom remaining in the European Union and this is something we are unable to support".
Ms Rees-Mogg told talkRADIO that although she was "no fan" of Mr Johnson, she would support him in order to see Brexit delivered.
Farage´s party accused the quartet of being in cahoots with the Conservatives and noted that Rees-Mogg's brother serves in Johnson´s government.
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'I find it absolutely unbelievable but tragic that the Brexit Party, with so many wonderful people, are now the very party risking Brexit, ' she added.
Mr Longworth was sacked after voicing criticism of Mr Farage's decision to stand candidates in marginal seats held by Labour - a move that may block the Tories from taking seats by splitting the Leave vote.
The Brexit Party leader announced last month that his party would not stand in seats now held by Tories, after initially claiming they planned to contest every seat.
Naomi Smith, chief executive of pro-EU campaign group Best For Britain, said: "As if it wasn't obvious before, the Tory party have completely morphed into the Brexit Party. Labour does not have a plan".
"In the case of John Longworth, who was for years the firmest advocate of World Trade Organisation withdrawal that we have ever met, he underwent a metamorphosis into being a supporter of the new European Union treaty following two days of meetings in London".
The Brexit Party, formed earlier this year, won 29 seats in July's European Parliament elections.