But even the lawyers for the committee acknowledged in an internal memo obtained by The New York Times that it will be a challenge to make a strong case of improper political influence.

In the memo, obtained from investors last week, Mr. Forstmann acknowledged that his firm's investment strategy shifted under Mr. Bowles.

The next year, according to an internal memo obtained by Nigerian dissidents, the company specifically asked the military Government to deploy its mobile police.

"Hunter stated that he saw Jones inject herself with EPO," the Internal Revenue Service agent Erwin Rogers wrote in a memo obtained by the newspaper.

Internal memos and intelligence reports obtained by Gustavo Petro, a Colombian congressman who is compiling evidence against Mr. Osorio's office, underscore the difficulties prosecutors and investigators face daily.

An internal memo obtained earlier in November by The Detroit News listed the Flint plant where Jerry Roy works among factories intended for closing.

According to a series of memos obtained by The New York Times, the agenda of the tribes was discussed by White House political aides and Democratic campaign officials.

Mr. Palmer is planning to carry out major organizational changes within the troubled $14 billion computer maker, according to internal memos obtained by PC Week, an industry trade publication.

Questions are raised about the authenticity of memos obtained by the CBS television network and broadcast on its September 7 issue of 60 Minutes.

A week later, according to a memo obtained by Congressional investigators, Meese noted that he had told his counselor, T. Kenneth Cribb, to "stay on top of" the situation.