Three men who showed up in full Nazi regalia to a hardcore punk show at an Old City bar Friday night were attacked by as many as 50 people on the streets after leaving the venue, according to witnesses and club management.

The headlining band at the Khyber that night was Murphy's Law, led by front man Jimmy G, who formerly went by the moniker Jimmy Gestapo.

In an e-mail to the Daily News, Jimmy G confirmed that some guys had showed up to the concert in "full Nazi field dress."

"And they did get their asses kicked," he wrote. "Again."

Khyber owner Stephen Simons, who was not at the show, said he had been told that the crowd inside "largely ignored and mocked" the three men.

But after they exited the club, on 2nd Street near Chestnut, they were attacked by a group of up to 50 people, he said.

"I guess being on 2nd Street in SS uniforms on a Friday night is a way to incite a semi-riot," Simons said.

An attendee of the show who asked not to be named posted a blog entry about the event Saturday and removed it Sunday after receiving "really negative feedback," he said.

In the posting, he had described the men as tattooed with "Nazi-inspired symbols" and as wearing "camouflaged combat pants; woolen, WWII-era coats adorned with SS emblems and authentic Third Reich hats with Nazi insignias emblazoned atop them."

He said the crowd kicked and punched the Nazi-wannabes and used weapons that included beer bottles and cue balls, although postings on other online- message boards describe the attack as more tame.

The only information police have on the incident is that they responded to a report of a disturbance on 2nd Street at 11:33 p.m. No arrests, hospitalizations or assaults were reported, a police spokeswoman said.

Simons said it was the first time anyone had shown up at the Khyber in Nazi gear.

"As a Jew, I am totally offended by them wearing the uniforms," he said. "But, as an American citizen, I totally uphold their right to dress however they want to dress."

He said that although men dressed as Nazis were at the downstairs show, at the same time a largely gay dance party was going on upstairs.

"There was a man on the second floor wearing a wedding dress," he said. "I don't think he had any problems going out on 2nd Street."