Federal Bureaucracy

Why is there a popular perception that the federal bureaucracy is unresponsive to the public and its elected leaders?  In your answer, be sure to explain the functions of the federal bureaucracy and constraints upon its power.  In what ways does it resemble the three Constitutional branches of government?  Please only use the sources provided! Thank you.  additional sources that could be used:  https://www.vice.com/en/article/akddx8/proposition-22s-victory-shows-how-uber-and-lyft-break-democracy