Why are those like Hannity, O'Reilly and Limbaugh Union members and union bashers?

Because it benefits their corporate cronies and masters to break the unions.

Public sector unions DON'T have competition, it's basically a monopoly......If we don't like their service, we simply just CAN'T call a separate police force, or firemen. But, if we don't like a union supported product, like a FORD vehicle, we can always buy a Honda, or Subaru.....This is the stranglehold Public Sector Unions have on the tax payers...The Unions vote in their OWN bosses, (democratic congressmen, like the ones that fled to Illinois) who decide what their pay/benefits package will be, all provided of course, by the tax payer......Wisconsin's tax payers were getting sick of paying HIGH taxes, so they voted Walker in to do something about it.

**EDIT** They may not have a "right" to strike, but they DO anyways. Ny, Philly, even the recent "Milwaukee school closings" for calling in sick.