The American Center for Law and Justice is demanding New York City officials allow a Christian group to show a documentary about survivors of the Sept. 11 attacks.
The Christian Action Network was hoping to show "Sacrificed Survivors: The Untold Story of the Ground Zero Mosque" in city parks.
However, the city's Department of Parks and Recreation has continuously denied the group's requests, saying the documentary's content draws concern.
The film includes reaction from survivors about the controversial mosque near Ground Zero.
In a press release, CAN said the city is "guilty of operating with a politically correct double-standard" and had previously approved a showing of different film "supported by powerful Muslim-American groups."
ACLJ attorneys sent a letter to the city Thursday calling the denials a violation of the First Amendment.
"The city's refusal to approve CAN's applications due to disagreement with the content and viewpoint of the documentary violates CAN's First Amendment rights," they said. "The First Amendment to the United States Constitution prohibits the government from 'abridging the freedom of speech.'"
ACLJ attorneys added that the department lied on at least one occasion, denying CAN's request because the parks were "booked" when they were actually available.
The documentary showings were planned to coincide with the the upcoming 10th anniversary of 9/11.
ACLJ is threatening legal action if officials don't cooperate.