Communism started out as a form of socialism. However it was derailed by human greed for power and wealth. If people demand too much shoot them on the protest line!
Capitalism was more up front. Give the lions share to the greedy and wealthy and use others as servants to the system. If people demand too much shoot them on the picket line!
The bottom line is that neither gives a shit about the little guy, although lying bastards on either side would argue otherwise!
However, capitalism today is the greatest threat because it wields the most power. Capitalism has money and governments of the western world in it's arse pocket. Today it is growing into the more dispicable of the two.