Companies hired pinkertons to
a)move employees to company towns.
b)negotiate with unions in the workplace.
c)force scabs to cross picket lines.
d)report on and bust unions.

the answer is c     : )

explanation:

i don't have an explanation because i don't know, but i think the answer is c because i googled it and google is right : ) just kidding google isn't allways right but the answer is still c. i hope this !