Chattanooga VW workers reject UAW, 53-47%

[pbrower2a]

The construction unions serve not only to give their members a say, but they generally provide employers with a labor pool certified to be skilled at their task.  That function is likely why the construction unions are able to command a premium.

If you want a project built on time and not over budget, then you need skilled construction workers who are more precise in their work and less likely to have accidents that stop work.