The Chinese communists used the insurgent approach of protracted popular war to conquer China after World War II.
Hope this helps!
I think it happened because president Hayes had a bad reputation at that time and the idea was, the congress should be stronger to "look at his hands".
The hacker can either use R.A.T (Remote administor tool), Trojan, Or other malware to infect that computer. Also worm can infect other computers by spreading over the network
