Social and emotional learning is the latest trend in your child's classroom. SEL sounds beneficial, but that's a disguise. In truth, it often indoctrinates kids with extremist ideas many parents don't condone.

Monday, the Hartford Courant reported that West Hartford, Conn., elementary-school parents are in an uproar. They're complaining that teachers are putting words like "nonbinary" on the chalkboard and telling kids, including kindergarteners, they can live life as a gender different from what they were assigned at birth. School authorities told parents that they can't opt their children out.

Most Americans think parents should have the final say on what children are taught. From Treasure Valley, Idaho, to Greenwich, Conn., school-board candidates made SEL an issue in elections earlier this month.

Also Monday, Indiana Attorney General Todd Rokita encouraged parents to speak up and cautioned that SEL programs shift "the role of teachers from educators to therapists."

Fighting SEL is an uphill battle because it's not only favored by the left-leaning educational bureaucracy – it's also big business. "The SEL ecosystem today is flush with dollars," reports industry consultant Tyton Partners.

Billions in federal COVID-relief money for schools are being used to buy SEL programs and fund SEL instructors. Advocates and companies that produce the materials lobby Congress and the federal Education Department to ensure legislative language precisely matches what they're selling.

Nationwide, sales of SEL materials shot up 45 percent in a year and a half, to $765 million in 2021.

But parental opposition is also surging. Attorney General Merrick Garland asked the FBI to look into parents protesting issues like SEL at school-board meetings. His son-in-law is a co-founder of Panorama Education, a company raking in millions selling SEL materials to school districts. Conflict of interest?

And what about the billions of dollars the Democrats' Build Back Better legislation allocates to child care and pre-K? Will that money help indoctrinate even younger minds? Very likely. At least a dozen states, including New York, have already adopted SEL standards for preschool.

As for elementary school, gender-dysphoric kids make up less than 1 percent of the population. Protect them, of course, from bullying and discrimination. They need to feel safe. But don't brainwash the rest with one-sided, repeated lessons about gender issues.

West Hartford reportedly hammers away grade after grade, starting with a kindergarten-level book about a teddy bear who knows in his heart he is a girl teddy, not a boy teddy. Then a book about Aiden, who knows the sex he was assigned at birth is "wrong." Then a book about choosing pronouns. And another about a girl named Jazz who changes her gender identity.

Are kids reading that many books about the US Constitution?

One Arkansas father objected that his fifth grader's teacher showed a video of a transactivist's speech. Then the teacher, wearing a "Protect Trans Lives" t-shirt, invited the class to a pride celebration: "I'll be at Pride from 1 to 6. I hope to see you there."

SEL was originally sold as training children to control their emotions, manage their time and make good personal decisions. Teachers have always tried to instill these life skills. They're the same American values Benjamin Franklin proselytized in his autobiography 200 years ago.

But recently, SEL purveyors, including the Collaborative for Academic, Social, and Emotional Learning, have openly revised their goals. CASEL advocates "transformative SEL" to promote "justice-oriented civic engagement." Translation: make your kids into activists.

A South Bend, Ind., school district adopted SEL two years ago to curb substance abuse and bullying. Now parents, recognizing the radical messaging, are demanding more oversight.

Who's in charge of what your child learns? Parents need to take control. It's not an easy fight against the combined forces of educational profiteers and left-wing activists. But the stakes are too high to accept defeat.

Betsy McCaughey is a former lieutenant governor of New York.