How do members of Congress hold bureaucrats accountable for their actions?

How do members of Congress hold bureaucrats accountable for their actions?

      Now the process for impeaching an elected official is better known.

      Here's  a link on a way to impeach a bureaucrat:  http://wiki.answers.com/Q/How_do_members_of_Congress_hold_bureaucrats_accountable_for_their_actions#slide=1&article=How_do_members_of_Congress_hold_bureaucrats_accountable_for_their_actions

Here's some links to similarly themed articles:

      http://borderalert.usbc.org/destroying-america/immigration-news/legal-matters-impeaching-bureaucrats-and-removing-senators

      http://washingtonexaminer.com/bureaucrats-at-tiny-federal-agency-fmcs-buy-legions-of-luxuries-with-purchase-cards/article/2536649

      http://thehill.com/blogs/regwatch/156386-cornyn-obama%E2%80%99s-faceless-nameless-bureaucracy-ignoring-numerous-laws