"bourgeoisie" refers to the capitalist class. Made more rigorous, we can say the set of people who do not need employment to pay their bills, they can live off of investment income. They often still perform labor, but as a part of their own businesses.

The bureaucratic class depend heavily on employment income. They are very lucky to have their jobs, and could be easily replaced or eliminated. They are desperate to maintain the structure of the bureaucracy in which they thrive. They create a cost born by both the "working class" and the "capitalist class". They consume the resources of the capitalist class, and mis-allocate the labor of the working class. If the investors and employees could coordinate without them, more value would be created for the capitalist and more wages could be kept by the worker.