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Mr Sahady and Mr Bartley are both heavily associated with Resist Marxism – a loose ultra-conservative group found to have links to white supremacist organisations – while Mr Hugo ran, unsuccessfully, for congress in 2018 with an endorsement from the same group.

Mr Sahady is also reported to have organised the right-wing Free Speech Rally and Rally for the Republic, both in Boston, in the aftermath of the infamous Unite the Right march in Virginia inAugust 2017, during which a counter-protester was killed.

Attendees at both Mr Sahady’s events were vastly outnumbered by counter-protestors.

Another rally the software engineer led in Providence, Rhode Island attracted just a few dozen people – some wearing masks in an apparent bid to hide their identity.

He is also reported to have marched with members of far-right groups Patriot Prayer and Proud Boys in Portland, Oregon in June 2018 – an event which descended into such violence police in the city officially labelled it a riot.

And in January this year, he and other Resist Marxism associates led a counter-protest against the Boston Women’s March, which descended into a fracas, reports David Neiwert, author of Alt America: The Rise of the Radical Right in the Age of Trump and long-time observer