Some lyrical analysis:
"We found your weakness and it's right outside your door, now testify" - In the first part, Zack is trying to be coy about saying what he thinks the government's weakness really is. So think about it this way, what's right outside your door? The world and all the people in it. And if all those people would come together, what powerful tool of revolution we would be?
"Mass graves for the pump and the price is set" - For the mass graves part, Zack is referring to oil. In the middle eastern countries, the battle is for oil, and how that's the real cause for America's involvement over there. We want our oil supply safe, so we try to be a mediator and police officer for those countries. Mass graves? People in war die. That's what it's all about - so basically, there's all this fighting that we participate in to secure oil. You "pump" gas, and the price constantly goes up and down with middle eastern crises.
"Who controls the past now controls the future
Who controls the present now controls the past
Who controls the past now controls the future
Who controls the present now?" - In the last part, Zack is saying that whoever is in charge now, is still, has been, and always will be, in charge. Then he asks who's controlling everything now. Almost asking if we really want it this way, or if we're going to do something to change it.