For this lawsuit, ACLU is not alone, some other organizations: Parents, Family and Friends of Lesbian and Gays (PFLAG), the Matthew Shepard Foundation, Campus Pride, and DignityUSA, a Catholic LGBT organization, joined it.
Camdenton R-III School District’s custom-built filtering software as ACLU explains, relies on a database of websites that has a viewpoint-discriminatory category called “sexuality,” which blocks all LGBT-supportive information, including many websites that are not sexually explicit in any way.
The filter does, however, allow students to view anti-LGBT sites. (of course)
Before the lawsuit, ACLU contacted the school district which unblocked the access to 4 sites listed by ACLU but on no account, the filtering software was modified so let just say that nothing changed, they are still hundreds of LGBT sites which are always blocked.
Result, a federal lawsuit for the Camdenton R-III School District.