What important role do third parties often play in US national elections?

A.
causing major parties to fight one another
B.
breaking up major parties' dominance
C.
challenging people with more choices
D.
generating malice for larger parties

1. was “labor violence” inevitable and unavoidable ? what factors played into causing much of the confrontation between unions and big business. 2. what were some of the different and mutual demands of the various national unions? what tactics did they employ to realize their demands? 3. when viewed from the perspective of the corporations, what do you think they were so adamant in opposing unions?