At the end of the day it's up to communists who have sufficient understanding of political theory to educate people who are becoming disillusioned, and guide them towards effective methods for effecting change.

It's worth noting that the capitalist system cannot be separated from the political system. The government necessarily represents the interests of the class that holds power, and that's the capitalist class in a capitalist society. In order for the government to regulate business it must be a government that represents the working majority.