“The purpose of the union is: the overthrow of the bourgeoisie, the rule of the proletariat, the destruction of the old, resting on the class opposites of bourgeois society, and the creation of a new society without classes and private property. K. Marx.” - Soviet Poster by Gustav Klutsis, 1933.
The current unions have become a suppressive part of the bourgeosie and themselves need to be overthrown by the workers.