The band were performing an encore and had invited members of the audience on to the stage during a rendition of their song Kiss Me I’m Shitfaced.

The band followed this up with anti-white supremacy anthem Skinhead on the MBTA and a cover of the AC/DC hit TNT at which point a skinhead on the far right of the stage began performing the salute.

Video of the incident captures bassist Ken Casey striding across the stage and pushing the stage-invader to the floor.

A fracas ensues, with the Casey caught on camera offloading several sizeable punches.

Once the skinhead had been ejected from the venue Casey took to the mic saying: “Nazis are not fucking welcome at a Dropkick Murphys show.”

Check out footage of Casey giving the saluting moron what for below.

Angle two: