Answer the following questions true $($T$)$ or false $($F$)$:

a$.\_\_\_\_\_\_\_\_$ Some state laws authorize use of closed shops.

b$.\_\_\_\_\_\_\_\_$ A union can legally strike a jobsite to enforce the provision of a subcontractor clause.

c$.\_\_\_\_\_\_\_\_$ The Teamsters union is the largest member of the AFL$$CIO$.$