Damn, this article takes you places. First it talks about what happened in WWII, which is horrific, but not surprising. Then it says that the law wasn’t repealed until 1996 and because of that-

Forced sterilisations were most prevalent in the 1960s and 1970s, during the post-war baby boom. Many of those forcibly sterilised had physical and intellectual disabilities, mental health problems or chronic diseases such as leprosy.

Physical restraint, anaesthesia and even “deception” were allowed for these operations, according to a government notice in 1953.

They interview someone who was just 12 when it was done to them.

• One of the government’s justification for the practice was “It was lawful at the time”. Now the Supreme Court ruled the law was never constitutional.
• The Supreme Court also decided that “statute of limitations” does not apply so plaintiffs can still seek compensation.

Japanese source

Cool, maybe California can follow suit?