I Need A Little Help

Would anyone like to explain to why are teachers forced into membership and paying union dues? Why are they not given a choice whether or not they would like to be a member? Where are the rights of those teachers that do not want to pay the dues? And lastly, if money had nothing to do with the protesting, where is the AFL-CIO labor federation getting the $30 million they earmarked to help with the anti-budget repair bill here in Wisconsin?