Up until the 1970s, LGBT people of all kinds largely had a sense of being on the same side together. A major rift started in 1979, when cisgender woman Janice Raymond wrote the book Transsexual Empire, which outlined her transphobic conspiracy theory which told cisgender women to fear trans women. This started the trans-exclusionary movement. As a result, many feminist, lesbian, and women-only spaces became hostile to trans women. This dividing issue made it difficult for feminism to develop an understanding of transgender issues in general. In response, the movement of transgender studies began with an essay by trans woman Sandy Stone in 1987.[1] Today, the term TERF (Trans-Exclusionary Radical Feminist) means supposed feminists who discriminate against trans women.