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For four days last April students at a Emmaus High School in Pennsylvania were forced to watch videos selected by the "student-led" Gay-Straight Alliance.

The videos ranged from "9 Questions Gay People Have About Straight People" to a compilation of clips celebrating "marriage equality." There was also a video educating students about gender fluidity – the idea there is no such thing as male or female.

"My son expressed to me that he felt bullied by the administration for being a heterosexual man and being forced to listen to LGBT advocacy on a daily basis," one parent wrote in a letter to the school district.

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The East Penn School District claimed the videos, shown during daily announcements, were about anti-bullying and the LGBT movement. But parents argue it was more about indoctrination. And when they asked to see the videos – the school district refused.

"This is a gross violation of parental rights," Liberty Counsel attorney Richard Mast wrote in a June 22 letter to Supt. Michael Schilder.

Liberty Counsel, a law firm that specializes in First Amendment and religious liberty issues, is calling on the district to immediately release what they called "four pro-homosexuality" videos shown as part of the district's "Unity Week" and "Day of Silence" activities.

"It does not pass the straight face test for the District to claim it need not provide parents with the actual video links, although the District required more than 2,800 students to view these videos, with no prior notice to parents, and no opportunity to opt-out," Mast wrote.

Parents took their concerns to the school district – but they were rebuffed.

"Since when does a public school in the United States of America have the right to block a parent and tell them they will not allow them to see the controversial partisan programming they are requiring their children to watch," another parent asked in a letter to the district. "We have every right to expect that our children are not being subjected to partisan indoctrination in our public schools."