"Red Army" is slang, I believe
They kept people afraid for their lives and of that of their loved ones. SO if they were afraid they would not speak out against the government.
The answer is C.
Hope that helps :)
The civil service system is much better than the alternative, which was Patronage. as implemented by the Hoover Commission. Civil service sets employment competence standards for hiring and makes working a permanent career, not just until the next election. it was so outstandingly successful, that virtually every state and community government follows it to large extent.
I hope this helps :)