Twitter is permanently banning US right-wing conspiracy theorist Alex Jones and his Infowars show for abusive behaviour.

The company said Mr Jones won’t be able to create new accounts on Twitter or take over any existing ones. Twitter said Mr Jones posted a video on Wednesday that violates the company’s policy against “abusive behaviour.”

The video in question showed Mr Jones shouting at and berating CNN journalist Oliver Darcy for some 10 minutes in between two congressional hearings focused on social media.

Twitter CEO Jack Dorsey testified at both hearings, but did not appear to witness the confrontation.

Mr Jones had about 900,000 followers on Twitter. Infowars had about 430,000.

Twitter had previously suspended Mr Jones for a week. But until now it had resisted muzzling Mr Jones further.

Other tech companies have silenced Mr Jones by suspending him for longer periods, as Facebook did, and by taking down his pages and radio stations for violating hate speech and bullying policies.

Apple, YouTube and Spotify also took similar action.

Mr Jones heckled Darcy in a public hallway where reporters were waiting to enter the House committee room. He criticised the journalist’s reporting and appearance, referencing his “skinny jeans” and repeatedly saying, “just look at this guy’s eyes” and “look at that smile”.

At one point, he said Darcy was “smiling like a possum that crawled out of the rear end of a dead cow. That’s what you look like. You look like a possum that got caught doing some really nasty stuff – in my view. You’re a public figure too.”

Darcy has aggressively questioned social media companies about the forbearance they showed Jones, asking why they have allowed him to remain on their platforms for as long as they have.

Jones is currently active on Facebook; his suspension there recently expired.

-AAP