From Robin’s Readings and Reflections:

To an outsider, the Fernald school in Waltham Massachusetts looked like any other educational institution. During the school’s hay day in the 1920’s and 30’s, few passers-by would have guessed the dark secret lurking behind the brick walls – a secret penetrating to the heart of American liberalism.

Fernald was no ordinary school. Set up in 1848 with funds from the Massachusetts State Legislature, the institution was designed for the incarceration of “feeble-minded” children. Throughout the early 1900s, hundreds of thousands of low-intelligence (though not necessarily retarded) children were warehoused at Fernald in unspeakable conditions. Treated like animals and denied any affection, these “human weeds” were considered genetically inferior from the rest of society.

In his book The State Boys Rebellion, Michael D’Antonio shows that one of the purposes behind the Fernald school was to prevent these “idiots” from reproducing and diluting the gene pool. Margaret Sanger, icon of the American left and founder of Planned Parenthood, put it even more succinctly: “The undeniably feeble-minded should, indeed, not only be discouraged but prevented from propagating their kind.”

It was not until the 1960s that the school began releasing their children to live in the outside world.

It goes on to mention LF.