The law is whose lawyers prepare and present a better case to the Judge/Jury. Right/Wrong, innocent or guilty have no actual bearing on what a judge or jury rule. It's based on many things up to and including Jury Nullification in the case of a jury trial.
Going to court is always a crap shoot, why do you think most Corporations settle? Not the case with rival unions though, you guys won't be happy until you bankrupt your unions and your members. Have fun kids and don't throw to much sand at each other.