Congressional Research Service (CRS) reports are written by staff members at the Library of Congress and are intended for use by the members of Congress.   CRS reports are typically written to explain pending legislation, provide legislative history or give a general policy overview of an issue to a member of Congress. 

CRS reports are not officially published anywhere and not all of them are available to the public, which can make them difficult to find.   Bloomberg Law has a collection of CRS Reports (in the Legislative & Regulatory page, under Legislative Resources).

CRS reports are also made available online from a number of organizations and libraries. Try searching "CRS Report and [title of report]" in Google or Worldcat.

Some free online collections of CRS reports include: