Jeremy Corbyn could face a fight for his political life against two of his closest allies, under Conservative plans to cut the number of MPs.
The veteran socialist's seat north London is due to disappear as Parliament shrinks from 650 to 600 members by 2020.
The Conservatives say that the reforms will save taxpayers millions of pounds.
But critics have accused the party of attempted gerrymandering amid claims the changes will create another 30 safe Tory seats.
Some high-profile Conservative MPs could also be among the causalities.
They include the former chancellor George Osborne, according to the latest official proposals.
Similar plans, to be published at the end of next month, are expected to see Scotland lose up to 6 of its current 59 seats at Westminster.
In England and Wales the most intriguing battle could be at the heart of the Labour leadership.
Mr Corbyn is widely expected to easily win re-election as leader next month, despite a walkout from 50 members of his shadow cabinet.
But he may face fight for a seat with neighbouring Labour MPs.
These include his shadow health secretary Diane Abbott, with whom he had a relationship in the 1980s, and who currently holds the seat of Hackney Central.
Another nearby MP is Mr Corbyn's shadow foreign secretary Emily Thornberry.
Mr Corbyn's leadership rival Owen Smith could also face a fight for his political survival.
Under the plans his Pontypridd seat will be merged with the neighbouring Cynon Valley constituency of veteran backbencher Ann Clwyd.
A series of Labour ‘moderates’ including Chuka Umunna, Yvette Cooper, and Tristram Hunt all face facing significant changes which could leave them vulnerable to de-selection attempts by hardline Corbyn supporters.
While Theresa May’s Maidenhead seat remains unchanged, other Tories face an uncertain future.
The seats of Cabinet members Liam Fox, Jeremy Hunt and Amber Rudd escape unscathed, but Brexit Secretary David Davis's Haltemprice & Howden constituency in East Yorkshire is cut in two.
Other high-profile figures whose seats are set to go include former deputy Prime Minister NIck Clegg, former Labour leader Ed Miliband, Labour firebrand Dennis Skinner, and Ukip MP Douglas Carswell.
Sources close to Mr Corbyn dismissed suggestions that he would lose his home base under the changes, saying there was "every reason to believe Jeremy will still have a seat to contest".
Conservative chairman Sir Patrick McLoughlin said the party would follow a policy of "no colleague left behind" to minimise the disruption to sitting MPs.
"This constructive approach is in strong contrast to the Labour Party which is riddled with infighting and threats of deselection," said Sir Patrick.
The Liberal Democrats said that they were "confident" of holding all of their eight seats and gaining at least one in Cambridge.
But a spokesman said the party had "serious concern" about the decision to base the changes on populations recorded in the electoral roll for 2015, which had become "out of date" after 2 million additional voters registered ahead of this year's EU referendum.
An SNP spokesperson said: "Scotland faces a deep and growing democratic deficit at Westminster, with unwanted Tory policies being imposed on Scotland.
"The SNP will continue to be a strong, united and effective opposition to the Tory government but the more Scotland's views are sidelined the more Scottish people will conclude that independence is the only viable option."
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