The Dropkick Murphys got more than they bargained for last week after inviting fans onstage during a show at New York City's Terminal 5. The Boston punk band, which is known for an especially busy schedule during St. Patrick's Day season, was joined by a slew of concertgoers while performing AC/DC's ‘T.N.T.' As one fan joined the melee, he began flashing the "sieg heil" Nazi salute -- a gesture that apparently didn't sit right with bassist-singer Ken Casey.

What happened next isn't entirely clear. Videos of the incident (check out one posted above and another below) aren't quite clear enough for one to definitively say what went down, but at least one report (via Loudwire) suggests Casey shoved the concertgoer to the ground and eventually had him kicked him out of the venue.

What is clear on the video is that at one point, a member of the band can be heard telling the audience, “Nazis are not f—ing welcome at a Dropkick Murphys show!”

After that ugly incident, we don't expect any Nazis will show up at any stops on the band's just-announced North American tour, which kick off April 6 in Honolulu and runs through June 30 in Gibbons, Canada. But just in case, please be careful! Check out their full itinerary here.

Watch Dropkick Murphys Member Confront Nazi Concertgoer