A spokesperson for Greater Manchester Police said a man aged 29 had been arrested “on suspicion of assault and public order offences” following a protest in Manchester City Centre on Saturday 9 February”.
The force said he would remain in custody for questioning.
The 29-year-old is believed to be Goddard, who was filmed telling a journalist at the protest: “I’ve warned you, I swear to god when there’s no police around here, I’m going to take your head off your shoulders, and all the football lads will as well, your card is marked.”
The National Union of Journalists (NUJ) said Saturday’s alleged attack was just one in a “disturbing increase in attacks and threats both offline and online”.
General secretary Michelle Stanistreet said in a statement: “The NUJ unreservedly condemns all threats against media workers, this behaviour is outrageous and unacceptable and it is vital that the police do all they can to ensure journalists can do their jobs safely.
“The authorities need to wake up to this escalating problem and tackle it robustly.”
Goddard’s social media presence and pages on crowdfunding websites – most of which have since been taken down – paint a picture of a pro-Brexit, anti-Muslim activist with a love of confrontation, and a fondness for the far-right activist Tommy Robinson.