The exposure of internal information to outside sources is called whistleblowing. There might be people within an organization that are involved in corrupt practices, and others who feel uncomfortable about it. Coming out and exposing corrupt practices is accepted, and the law protects all whistleblowers from any sort of discrimination from the organization.
A Qui Tam action lawsuit is brought forward by individuals who believe an organization is defrauding the government in a particular way. In most cases, the person taking action is an employee of the organization. A Qui Tam claim allows the government to recover the amount lost because of fraud. The employee who comes forward with the information might receive a small percentage of the recovery as a reward.