Found an article that might be useful reading for this thread:

What is the united front? It is the organizational expression of a broad unity of action by diverse forces against a common enemy. The purpose of the united front, the reason for its existence, is to unite the many to defeat the few.

And this:

“We must use Marxism, which is positive in spirit, to overcome liberalism, which is negative. A Communist should have largeness of mind and he should be staunch and active, looking upon the interests of the revolution as his very life and subordinating his personal interests to those of the revolution; always and everywhere he should adhere to principle and wage a tireless struggle against all incorrect ideas and actions, so as to consolidate the collective life of the Party and strengthen the ties between the Party and the masses; he should be more concerned about the Party and the masses than about any private person, and more concerned about others than about himself.