DANA DiFILIPPO, Daily News Staff Writer difilid@phillynews.com, 215-854-5934 Posted: Tuesday, September 23, 2014, 3:01 AM

WHEN an anti-Islamic group decided to advertise on city buses and billboards this fall with photos of a terrorist poised to behead an American and a Muslim leader smiling at Adolf Hitler, transit officials in New York and Washington, D.C., huffed their disapproval - but allowed the ads to run.

They had no choice, they said, because the ads were protected under the First Amendment.

SEPTA's officials disagreed and rejected the ads.

But the group behind the ads - the American Freedom Defense Initiative - won't surrender quietly. The New Hampshire-based group sued SEPTA in federal court last week, complaining that the transit agency violated AFDI's free-speech rights.

One local First Amendment expert says SEPTA picked an unwinnable fight.

"The most fundamental principle of the First Amendment is that you may never bar any message based upon the content of the message," said Burton Caine, a law professor at Temple University and past president of the Philadelphia chapter of the American Civil Liberties Union. "This is absolutely prohibited, what SEPTA is doing.

"Everybody has this same idea that they like the First Amendment," Caine said, "but when the speech is offensive, people will make all kinds of excuses why it's not protected. The whole point of the First Amendment is to protect speech that offends. No exceptions."

A federal judge said as much in 2012, ruling that the AFDI could post ads in New York City and Washington, D.C., that compared Muslim jihadists to "savages."

More here:

SEPTA's ad refusal sparks free-speech fight