"which of the following is a part of the false claims act that allows a private citizen to file a suit in the name of the u. s. government, charging fraud by government contractors and other entities who receive or use government funds? "

Qui tam

Explanation:

In common law of the federal government, "Qui tam" is a common lawsuit where any entities or individuals who have the evidence or the knowledge of the fraud against the federal government or the federal contracts and programs can file a Qui tam suit to sue the people or the entity committing the fraud on behalf of the U.S. government.

Qui tam comes under the federal governments's False Claims Act or FCA.

In Qui tam suit, the government is permitted to join or intervene the action.

Thus the answer is ---

Qui tam

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