California has become the first U.S. state to have its public schools teach gay history. Democratic Gov. Jerry Brown signed a bill Thursday that would require the contributions of LGBT Americans throughout history to be included the state’s educational syllabus. The bill was authored by Sen. Mark Leno of San Francisco, and has drawn loud opposition from conservative and evangelical groups in the state. “It is an outrage that Governor Jerry Brown has opened the classroom door for homosexual activists to indoctrinate the minds of California’s youth, since no factual materials would be allowed to be presented,” said Rev. Louis Sheldon, chairman and founder of the Traditional Values Coalition, which represents more than 43,000 churches. But California law already requires schools to teach students about the contributions of other minority groups, and Sen. Leno’s office cited research showing that schools that teach students about LGBT people and issues are perceived as more inclusive. “History should be honest,” said Gov. Brown in his statement following the signing of the bill into law.