I am totally in favor of what the labor unions did in the 1900's but they have failed to adapt to changing times and they have become a political power more than a force of good for the average worker. The Boeing employees in South Carolina agree - from The Seattle Times:
Boeing’s South Carolina workers resoundingly defeat union
Nearly eight years after production workers at Boeing’s 787 manufacturing plant in South Carolina ousted the Machinists union, a much enlarged workforce voted decisively Wednesday to keep the union out.
The result was a blowout.
Out of the approximately 3,000 workers eligible to vote in North Charleston, 2,828 cast ballots, with 74 percent voting against the International Association of Machinists (IAM).
The labor climate in South Carolina:
The odds were always stacked against the IAM in South Carolina, a state that is politically and legally hostile to unions. It has the lowest percentage of union members of any state in the United States, 2.6 percent of employed workers.
And with membership not mandatory in a unionized workplace in a “right-to-work” state, the rate of union membership is even lower, just 1.6 percent.
National average is about 5%. I can see a place for unionization in some places - fire, police, hospitals, etc... but not schools, not government and definitely not industry.