The story of the Institute of Sexology should be mandatory learning in all schools. It is arguably where the science of gender and sex were codified and became a field, featuring such hits as development of HRT, gender affirming surgeries like top surgery and bottom surgery, and understanding of gender and sex which were inclusive of gay, bisexual, asexual, trans identities, etc. Hirschfeld advocated free sex education and contraceptives, and destigmatization of LGBT identities. He coined transsexual, as a departure from transvestite, and wrote medical passes for trans people to show police who would hassle them for crissdressing.
The Institute of Sexology, was burned by the Nazi regime. It was one of the earliest targets and one of the biggest, of the book burning efforts, and the majority of photos depicting Nazi book burnings were from that one specific event. It had medical research, records, case studies. The burning of the Institute set back the entire scientific field entire decades.