Besides striking?

I’m areas where unions were technically or just outright illegal, one of the things workers would do is wear a red bandana or just cloth around their necks or over their mouth and nose. This was meant to show solidarity with other workers, even if they couldn’t openly have a union.

A lot of people think this is where the term “redneck” comes from but this is actually false. The term “red neck” originated in the American South during the reconstruction as a semi-derogatory name for southern farmers.