A Marine veteran and Academy Award winning film producer said he was barred from speaking to a U.S. government class at a Montana high school because he was “a right-wing conservative.”

Gerald Molen, who won an Oscar for co-producing Schindler’s List, had been invited to speak to a class of seniors at Ronan High School in Montana. He’s also one of the few conservatives working in Hollywood and is currently making a documentary based on Dinesh D’Souza’s book, “The Roots of Obama’s Rage.”

Molen, who is a popular motivational speaker, said his speech was going to be apolitical. He had planned on reminding students of their individual greatness and opportunities for the future.

But when he showed up at the high school — about 90-minutes from his home in Bigfork, Mont. – the principal informed Molen that he would not be allowed to address students because he was a “right-wing conservative.” He was told that there had been some calls to the school complaining about the planned speech.

“He said some callers didn’t want kids exposed to that, despite not knowing what my message would be,” he told the Hollywood Reporter. “

Molen, who also worked on films like “Jurassic Park,” and “Twister”, wrote a letter in the local newspaper, explaining what happened and expressing is outrage.

“I served three years in the Marine Corps so that others might stand before their peers or even a group of students, but never did I think my voice would be stilled by some mysterious caller(s) on the notion that I might say something they ‘thought’ would not be in the students’ best interests,” he wrote in The Daily Inter Lake.