Throughout the 1960s and early 1970s, Blackstone worked closely with local LGBT activist groups such as the Mattachine Society, Daughters of Bilitis, the Vanguard gay youth group, the National Transsexual Counseling Unit, and the Council on Religion and the Homosexual.
During the 1960s and early 1970s, Blackstone maintained a close relationship with prominent LGBT organizations like the Mattachine Society, Daughters of Bilitis, the Vanguard gay youth group, the National Transsexual Counseling Unit, and the Council on Religion and the Homosexual.