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The tranny ideology was invented by this guy - Magnus Hirschfeld, in 1920s Berlin
He came up with the concept and coined the term "transsexual"
The first dick chopping surgery was performed at Hirschfeld Institute by Ludwig Levy-Lenz
Hormone therapy for trannies was pioneered by Harry Benjamin
Kurt Freund came up with the modern transsexual typology (androphilic vs autogynephilic)
Kenneth Zucker and Robert Spitzer added "Gender Dysphoria" to the DSM
Richard Green authored a study that concluded hormones are the only cure for Gender Dysphoria