What are government corporations like the Postal Service and Amtrak supposed to do?

According to most social scientists, the only thing Americans hate more than Bureaucracies is presidential overreach

It is easier to try to limit the activities of a bureaucracy than to try to shrink it or get rid of it.

If the Senate does not approve of an agency head proposed by the President, they can appoint their own choice instead.

"Deregulation" means limiting the number of "controls" that an agency is allowed to enforce.

The tactic of "devolution" refers to situations where states and cities refuse to take care of certain functions in an effort to force Congress to assume responsibility.

President Bush (#43) created a new cabinet department called the "Office of Homeland Security"

Privatization means turning over government functions to corporations.

If an appointed agency head disappoints Congress, the Senate has the power to veto them "after the fact"

Deregulation is intended to lower the costs so people pay less for things, but when it came to the airlines, it backfired and made air fares more expensive.

Another function of agencies is to maintain the "union". How does the IRS do this?