Plenty of governments do not permit collective bargaining by their employees--including parts of the U.S. federal government--and those employees do not suffer the problems you imply they should. Federal workers, even unorganized federal workers, are generally well-protected from political interference and politically-motivated layoffs.<p>There are arguments for public unions, but protecting employees from political machinations is not one of them--especially since unions themselves are usually politically active, attempting to influence elections and legislation.