Matt Salmon remembers getting into a circle with the other teenagers in his group therapy session and shouting obscenities at a gay boy forced to stand in the middle.

And he recalls being made to sit on the floor and hug other men because, his therapist said, his sexuality was driven by a “void” that needed to be filled with “healthy male intimacy.”

Nearly 20 years later, Salmon is still shaken by his late teenage experience with “conversion therapy,” the discredited practice that purports to “convert” gay people to heterosexuality and is the focus of a blockbuster appeal to be argued before the Supreme Court on Tuesday.

“I remember watching these boys as they’re essentially being retraumatized and just broken down,” Salmon recalled in an interview with CNN. “I’ve done a lot of healing, but those wounds are still very much present.”

Days after returning to Washington following its summer break, the Supreme Court will turn its attention to a six-year-old Colorado law that prohibits licensed counselors in the state from practicing conversion therapy on minors – one of a series of cases the 6-3 conservative court has heard, or soon will, that deal with gay and transgender young people.

Salmon is one of several victims of the practice who have submitted briefs at the Supreme Court supporting Colorado.

Just a few months ago, the Supreme Court let stand a Te