It has steadily declined. The unions are not used nowadays at all. In the 70s approximately 35% of people were unionized. In 2013 only 11.5% of workers belong in a union and fight for workers rights. Unions strength has weakened because people are not interested in them.
When the proper court determines that a legislative act (a law) conflicts with the constitution, it finds that law unconstitutional and declares it void in whole or in part. This is called judicial review.szszf
It is the opposing thought as to why one side is wrong.
The first step in a trial is to select from the panel the number of jurors required to try the case.