People reporting corruption are always worried about being identified and subjected to torture or harassment from the minions of the corrupt person.
In some countries, people that report corruption are protected by providing a toll free number wherein they can report corruption anonymously. They don't need to identify themselves, instead they need to identify the corrupt persons, the departments where corruption occurs, and other activities that contributes to the implementation of corruption.
People who report corruption may be called whistle-blowers. They may become part of a witness protection program of the government if the corrupt person they are reporting holds vast power and influence that the whistle-blower's live and his or her family is in danger.