Josh Cowen is a Professor of Educational Policy at Michigan State University. He has spent many years as a voucher researcher and recently concluded that vouchers are a failed experiment, based on a multitude of research studies.

As soon as anyone becomes a critic of charter schools or vouchers, the choice lobby attacks them and claims they are paid by the teachers’ unions. I know this from personal experience. A few years ago, a choice lobbyist accused me of taking union money to buy the house I lived in; I assured her that I paid for my home all by myself.

Funny that the shrill well-paid lobbyists act as though unions are criminal enterprises, when in reality they have historically enabled poor and working class people to gain a foothold in the middle class, to have job security, health benefits, and a pension. They also give public schools a voice at the table when governors propose larger classes, lower standards for new teachers, or decreased funding for schools. I believe we need unions now, more than ever. Whenever I hear of a charter school unionizing or of workers in Starbucks or some other big chain forming a union, it makes my day.

Josh Cowen has undoubtedly been subject to the same baseless criticism from the same union-haters whose salaries are paid by plutocrats. He shares his thoughts here about teachers’ unions.

Here in Michigan, the Democratic legislature just re-affirmed our state’s longstanding commitment to working families by removing anti-labor provisions from state law. The move doesn’t apply to teachers and other public employees, because the conservative U.S. Supreme Court sided a few years back with Right-wing activists in their efforts to hinder contributions to public sector unions, but it’s still good news for the labor movement overall.

And I wanted to use their effort—alongside Republican efforts in other states to threaten teachers for what they say in classrooms—to make a simple point.

We need teachers unions. Other folks more prominent than me, like AFT’s Randi Weingarten, have made this point recently too. But I wanted to add my own voice as someone who has not been a union member, and someone who—although I’ve appeared with Randi on her podcast and count many union members as friends—has never been an employee or even a consultant.

If you want to talk dollars, The Walton Family Foundation once supported my research on charter schools to the tune of more than $300,000. Arnold Ventures supported my fundraising for a research center at Michigan State–$1.9 million from them. And the US Department of Education awarded my team more than $2 million to study school choice—while Betsy DeVos was secretary.

Think about that when I say school vouchers are horrific. And understand, I’m getting no support from teachers’ unions.

Instead it is I who supports them.

I’ve been studying teacher labor markets almost as long as school vouchers. Mostly my research has looked at teacher recruitment and retention. But I’ve also written about teachers’unions specifically. There’s a debate among scholars on what unions do and whether their emphasis on spending translates into test score differences. In the “rent seeking” framework economists use, the concern is that dollars spent on salaries don’t have direct academic payoffs.

There is no question that spending more money on public schools has sustained and generational impacts on kids. Research has “essentially settled” that debate, according to today’s leading expert on the topic.

But I want to branch out from dollars and cents and test scores to talk about teacher voice.

And I want to do that by raising a few questions that I’ve asked myself over the last couple years:

Why should the voice of a billionaire heiress from Michigan with no experience in public schools count for more than the voices of 100,000 teachers in my state’s classrooms every day?

Why should the simple fact that they work with children made by other people mean that teachers surrender their own autonomy and judgment not just as professionals but as human beings?

Why should educators have to work under what amounts to gag orders, afraid to broach certain topics or issues in the classroom? Some states are setting up hotlines to report on teachers as if they’re parolees, and a bill in New Hampshire would essentially give the fringe-Right Secretary of Education subpoena power to haul teachers in front of a special tribunal for teaching “divisive concepts.” This, after a Moms for Liberty chapter put out a bounty on New Hampshire teachers who were likewise divisive on an issue. Read: an issue of race or gender.

It’s not just threats to teacher employment. We know this. There are threats to teachers’ lives. How many teachers have died alongside their students—other people’s children—over the years in school shootings?

Why does the Right claim to trust teachers enough to arm them with guns in response to those shootings, but not enough to let them talk about race, gender, or any other “divisive concept?” Even some conservative commentators have worried publicly that we’re asking teachers to do too much. Why are we asking them to be an armed security force too?

‘In her recent history of “The Teacher Wars”, The New York Times’ Dana Goldstein noted that teachers formed unions, and fought for teacher tenure, to protect themselves not just professionally but personally. For free speech. To prevent harassment from supervisors—then as now, teachers were mostly professional women—and to keep from being fired for pregnancy or marital status.

So really, attacks on teachers are nothing new. Instead, teachers seem to be one of the few professions that it’s still acceptable in political conversation—even a mark of supposed intellectual sophistication in some circles—to ponder the shortcomings of the educators who work with our kids every day.

There’s nothing sophisticated about attacking hardworking, thoughtful, and dedicated people. And the only result of doing so will be the further erosion of our public, community schools. And that’s really the point. Just a few days ago, we learned that the big data that I and many others have gotten used to working with finally caught up to the on-the-frontlines warnings of educators everywhere: teachers are exiting the profession at unprecedented rates.

I’ve taken no money from teachers’ unions for any of the work I do. I’ve never been a member of a union—teachers’ or otherwise. Until now. Because after writing this today, I made a donation to my state’s primary teachers’ union and became a general member: a person “interested in advancing the cause of education…not eligible for other categories of membership.”

There’s a word for that in the labor movement. You hear it a lot here in Michigan, where I grew up and now teach future teachers in a college of education. That word is Solidarity.

Sign me up.