Chocolate can be bitter....

 The Bourgeoisie and the Proletariat are both related to Charlie and the Chocolate factory in more ways than one. Consider the Bourgeoisie acting as Willy Wonka or the whole company in general, and the Proletariat as the workers, otherwise known as "Oompa Loompa's." Willy Wonka claimed to have "rescued" these Oompa Loompa's from the jungle, when in actuality he found them to use for his own benefit. They represent the working class, the Proletariat, whose basic function is to manage the machinery, and act as a lower class having no real power. Willy Wonka represents the Upper class, the Bourgeoisie, whose a much higher class than the Proletariat and usually has power over them. So as you see you can easily relate the two and see how they connect with each other.