In 2005, when Tamara Green told the “Today” show and The Philadelphia Inquirer that Bill Cosby drugged and sexually assaulted her in the early 1970s, one of Mr. Cosby’s lawyers publicly branded the allegations “absolutely false,” while his aides approached another newspaper with “damaging information” about her, according to court documents.

Five years earlier, after an actress on Mr. Cosby’s TV series “Cosby” told the police that he had tried to put her hand down his sweatpants at his New York townhouse, Mr. Cosby’s lawyers threatened The National Enquirer with a $250 million defamation suit for publishing detailed comments about the incident by the woman’s relatives.

And when Mr. Cosby acknowledged an extramarital affair in a 1997 interview with Dan Rather, his agent telephoned the president of CBS Entertainment to demand that the segment not air on “60 Minutes” as planned. It did not, although CBS News said the decision had nothing to do with the call.

As accusations of sexual assault continue to mount against Mr. Cosby — more than two dozen women have gone public, the latest last Monday — the question arises as to why these stories never sparked a widespread outcry before. While many of the women say they never filed police complaints or went public because they feared damaging their reputations or careers, the aggressive legal and media strategy mounted by Mr. Cosby and his team may also have played a significant role.