Capitalism is the opposite of democracy. In a capitalist firm, the managers are not accountable to the governed (i.e. workers). The employer is not a delegate of the workers. They manage the company in their own name not in the workers' name. Managers do not have to have dictatorial control. It is entirely possible to have management be democratically accountable to the workers they govern as in a worker cooperative.

Capitalism v. Communism is a false dilemma. There are other options.