You should look at the pseudioscientist who coined all the gender ideology thats spewed about today:
John Money was a psychologist and sexologist from New Zealand who was one of the most prominent doctors in the field of gender theory and the idea of gender being a social cosntruct. In fact, He was one of the first researchers to publish theories on the influence of societal constructs of gender on individual formation of gender identity. Money introduced the terms
gender identity,
gender role and
sexual orientation and popularised the term
paraphilia.
Working with endocrinologist Claude Migeon, Money established the Johns Hopkins Gender Identity Clinic, the first clinic in the United States to perform sexual reassignment surgeries on both infants and adults. He spent a considerable amount of his career in the United States.
I suggest reading his wiki page and seeing how his actions are tying back into what the left considers to be "progressive" today.
Warning: it gets very dark
https://en.wikipedia.org/wiki/John_Money#Controversies