(a) A statute enacted, and a regulation or other action made, prescribed, issued, granted, or performed in respect of or by an agency or function affected by a reorganization under this chapter, before the effective date of the reorganization, has, except to the extent rescinded, modified, superseded, or made inapplicable by or under authority of law or by the abolition of a function, the same effect as if the reorganization had not been made. However, if the statute, regulation, or other action has vested the functions in the agency from which it is removed under the reorganization plan, the function, insofar as it is to be exercised after the plan becomes effective, shall be deemed as vested in the agency under which the function is placed by the plan.

(b) For the purpose of subsection (a) of this section, "regulation or other action" means a regulation, rule, order, policy, determination, directive, authorization, permit, privilege, requirement, designation, or other action.

(c) A suit, action, or other proceeding lawfully commenced by or against the head of an agency or other officer of the United States, in his official capacity or in relation to the discharge of his official duties, does not abate by reason of the taking effect of a reorganization plan under this chapter. On motion or supplemental petition filed at any time within twelve months after the reorganization plan takes effect, showing a necessity for a survival of the suit, action, or other proceeding to obtain a settlement of the questions involved, the court may allow the suit, action, or other proceeding to be maintained by or against the successor of the head or officer under the reorganization effected by the plan or, if there is no successor, against such agency or officer as the President designates.

(d) The appropriations or portions of appropriations unexpended by reason of the operation of the chapter may not be used for any purpose, but shall revert to the Treasury.