Solidarity is a fundamental principle for labor unions. Unionized workers have gone on strike over the past year in warehouses and factories, on the docks and on public transit, in hospitals and in legal aid organizations – and won. Public sector unions large and small have teamed up to secure more generous benefits. And some labor leaders are working together to address broader issues, such as skyrocketing health care costs, the affordable housing crisis and the clean energy transition.

Of course, unions weren't always on the same page. Many faced difficult endorsement decisions, from the presidential race to the New York City mayoral campaign. Challengers have emerged within unions, with 1199SEIU, TWU Local 100 and the Suffolk County Association of Municipal Employees handing the reins

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