Jeremy Corbyn has endorsed a plot by his hard-left supporters to “shut down the streets” by whipping up the biggest act of civil disobedience in decades to protest at Boris Johnson’s Brexit plans.

The Labour leader urged his MPs to join protesters planning to “occupy bridges and blockade roads” in 10 major cities in what some activists have already likened to the 1990 Poll Tax riots.

The demonstrations have been organised by Momentum, the campaign group formed to propel Mr Corbyn to the leadership of the Labour Party.

It came as John McDonnell, the shadow chancellor, compared Mr Johnson to Adolf Hitler and the author Sir Philip Pullman hinted the Prime Minister should be hanged amid an increasingly hysterical response to Mr Johnson’s decision to prorogue Parliament.

The Conservatives described Momentum’s plan as “sinister” and said it was evidence of the lengths to which Mr Corbyn’s supporters were prepared to go in order to “subvert the democratic decision of the British people to leave the EU”.