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On Sunday, a twitter user posted an image of a man riding a bus in Seattle, wearing a Swastika armband.
According to the person who initially shared the image, the man allegedly harassed 'a black man on the bus'.
The picture was passed on to the group Antifa - a coalition of groups who are in favour of opposing fascism.
The man with the Nazi armband was later spotted on the corner of Seattle's Third Avenue and Union street, and Antifa intervened.
Graphic footage of the moment he was punched soon hit YouTube and Instagram.
The anti-fascist community is celebrating the punch, while right wing commentators and the alt-right have labelled the left violent.
Seattle Police Department have tweeted about the incident:
Around 4pm Sunday, SPD received reports of a man wearing a swastika armband, instigating fights at 3rd Ave / Pine. (1/3) — Seattle Police Dept. (@Seattle Police Dept.)
Police were on scene in 5 mins & found him on the ground. He declined to provide info about incident & left after removing his armband.(2/3) — Seattle Police Dept. (@Seattle Police Dept.)
No one else at the scene contacted officers to make a report about the incident.(3/3) — Seattle Police Dept. (@Seattle Police Dept.)
More: What happened moments after a man made a Nazi salute