Pfizer was sued over a controversial drug trial on Nigerian children during an epidemic and decided the best way out was to "persuade" the Nigerian Attorney General to drop the legal action by investigating him for corruption links.
From The Guardian. See also here.
Liggeri said Pfizer was not happy settling the case, but had come to the conclusion that the $75 million figure was reasonable because the suits had been ongoing for many years costing Pfizer more than $15 million a year in legal and investigative fees. According to Liggeri, Pfizer had hired investigators to uncover corruption links to Federal Attorney General Michael Aondoakaa to expose him and put pressure on him to drop the federal cases. He said Pfizer's investigators were passing this information to local media, XXXXXXXXXXXX. A series of damaging articles detailing Aondoakaa's "alleged" corruption ties were published in February and March. Liggeri contended that Pfizer had much more damaging information on Aondoakaa and that Aondoakaa's cronies were pressuring him to drop the suit for fear of further negative articles.