The Right has given us plenty of indications of the dangers a second Trump term could pose to labor. To see how bad things might get, we can look to another example of a brutally anti-labor presidency: Ronald Reagan’s.
One reason the GOP hated the Unions was that Labor would do a lot of ground level organizing for the Dems. Things like getting petitions signed; driving voters to the polls; putting up signs. The Left failed to step up its ground game when the unions were decimated.