The unions have been cut back here - possibly too far at one time - they have slightly come back a tad- but in a much more reduced form and the days of Union power have mutated into obscurity.
Yet given that re-balance, they also perform a necessary role -
though it is largely primarily outdated nowadays - but a check does need to be there, and in that role alone they have some value.
Public or private- if it is effectively a closed shop enviroment, in any given workforce or Company, that needs looking at.