DENVER — Taliyah Murphy received a letter in early 2018 about a soon-to-be-filed class-action lawsuit brought on behalf of transgender women like her who were housed in men’s prisons in Colorado. It gave her hope. Murphy and other trans women in Colorado had faced years of sexual harassment and often violence from staff members and fellow incarcerated people. They were denied requests for safer housing options and medical treatment, including surgery, for gender dysphoria, the psychological distress that some trans people experience because of the incongruence between their sex assigned at bir…