please help me with this

Question

why did Congress pass the Taft-Hartley Act in 1947?
a. to protect union officials against undue invasion of privacy
b. to raise wages
c. to increase unemployment benefits
d. to restrict labor strikes that threatened the national interest

thanks for any help you give me :D

Answer 1

http://www.u-s-history.com/pages/h1667.html

http://en.wikipedia.org/wiki/Taft-Hartley_Act

Answer 2

i think it might be D...?

Answer 3

D is the one that makes best sense, yes.