Workers at companies like Kellogg’s, Nabisco and John Deere have hit the picket lines in recent weeks hoping to get a better deal from their employers. A new survey suggests the public by and large supports them.

Marcial Reyes could have just quit his job. Frustrated with chronic understaffing at the Kaiser Permanente hospital where he works in Southern California, he knows he has options in a region desperate for nurses.

Instead, he voted to go on strike.

And many of them are either hitting the picket lines or quitting their jobs as a result.

The changing dynamics of the US labor market, which has put employees rather than employers in the driver's seat in a way not seen for decades, is allowing unions to flex their muscle.