They lack 'standing' - the ability of a party to bring a lawsuit in court based upon their stake in the outcome.

Second, a private citizen can bring a lawsuit against a government body for failing to perform a non-discretionary duty.

First, a private citizen can bring a lawsuit against a citizen, corporation, or government body for engaging in conduct prohibited by the statute.

For example, a corporation has the personal right to bring a lawsuit (as well as the capacity to be sued) and, like a natural person, a corporation can be libeled.

The party bringing the lawsuit must be able to show that they are actually impacted by the law.