Frequently, the debtor in possession will institute a lawsuit, known as an adversary proceeding, to recover money or property for the estate. Adversary proceedings may take the form of lien avoidance actions, actions to avoid preferences, actions to avoid fraudulent transfers, or actions to avoid post-petition transfers. These proceedings are governed by Part VII of the Federal Rules of Bankruptcy Procedure. At times, a creditors' committee may be authorized by the bankruptcy court to pursue these actions against insiders of the debtor if the plan provides for the committee to do so or if the debtor has refused a demand to do so. Creditors may also initiate adversary proceedings by filing complaints to determine the validity or priority of a lien, revoke an order confirming a plan, determine the dischargeability of a debt, obtain an injunction, or subordinate a claim of another creditor.