Discuss the revolving door and other topics

Can you help me understand this Political Science question?

In chapter 7 on interest groups, your textbook discusses the role of the “Revolving Door” in outlining the ways by which interest groups gain influence over public policy. For this topic, I want you to do some research on the “Revolving Door.” Which industries rely the most on “revolving door” lobbyists? Which federal government agencies/departments employ the most “revolving door” bureaucrats? (Hint: see the Center for Responsive Politics website and/or the article “Revolving Door Lobbyists and Interest Representation” at http://www.palgrave-journals.com/iga/journal/v3/n1/full/iga201316a.html (Links to an external site.)) What do you think about the impact of the “Revolving Door” on American politics and public policy? Is it beneficial or harmful to democracy and why?