People's Front of Judea to Judean People's Front:

"Splitters!"

The Joke:

Klan holds rally at Gettysburg

Sun Sep 3, 11:39 AM ET

About 30 Ku Klux Klan members proclaimed hatred for blacks, Jews, gays and Latinos as they stood behind barricades at the Civil War battlefield where Abraham Lincoln delivered the Gettysburg Address.

Gordon Young of the World Knights of the Ku Klux Klan also called Saturday for the U.S. to pull its troops out of Iraq and use them to patrol the Mexican border to stop illegal immigration.

The World Knights obtained a permit in July for the two-hour demonstration. The National Park Service granted it under the group's First Amendment rights to free speech.

Several groups counterdemonstrated. Park Service spokeswoman Katy Lawhon said there were no major incidents; one man was cited for entering a restricted area carrying a rainbow flag.

The Punch Line:

…
Confederate re-enactors from Virginia protested the Klan's adoption of the Confederate battle flag as an emblem and its claim to be a continuance of the Confederate cause.

"These guys don't stand for anything I stand for," said Tim McCown of Jefferson, Md. "And it's time we disengage our flag from what they stand for."

Representatives of the national Sons of Confederate Veterans also came to protest the Klan's efforts to identify with the Confederacy. In a nearby park, churches and other groups held a Unity Day rally.
…

And the explaining-the-reference bit from “The Life of Brian” courtesy of this site...

BRIAN: Are you the Judean People's Front?

REG: Fuck off!

BRIAN: What?

REG: Judean People's Front. We're the People's Front of Judea! Judean People's Front. Cawk.

FRANCIS: Wankers.

BRIAN: Can I... join your group?

REG: No. Piss off.

BRIAN: I didn't want to sell this stuff. It's only a job. I hate the Romans as much as anybody.

…
REG: Right. You're in. Listen. The only people we hate more than the Romans are the fucking Judean People's Front.

P.F.J.: Yeah...

JUDITH: Splitters.

P.F.J.: Splitters...

FRANCIS: And the Judean Popular People's Front.

P.F.J.: Yeah. Oh, yeah. Splitters. Splitters...

LORETTA: And the People's Front of Judea.

P.F.J.: Yeah. Splitters. Splitters...

REG: What?

LORETTA: The People's Front of Judea. Splitters.

REG: We're the People's Front of Judea!

LORETTA: Oh. I thought we were the Popular Front.

REG: People's Front! C-huh.

FRANCIS: Whatever happened to the Popular Front, Reg?

REG: He's over there.

P.F.J.: Splitter!