; or (ii) section 502 of such Act (1-605.02, D.C. Official Code), establishing the power of the Board; (B) to preempt the laws described in subparagraph (A); or (C) to limit or alter the powers of the government of the District of Columbia pursuant to the District of Columbia Home Rule Act. (3) Actions of the authority Nothing in this Act shall be construed to preempt— (A) the laws of any State or political subdivision of a State that substantially provide for the rights and procedures described in section 3(b); (B) the laws of any State or political subdivision of a State that substantially provide for the rights and procedures described in section 3(b), solely because such laws provide that a contract or memorandum of understanding between a public employer and a labor organization must be presented to a legislative body as part of the process for approving such contract or memorandum of understanding; or (C) the laws of any State or political subdivision of a State that permit or require a public employer to recognize a labor organization on the basis of signed authorizations executed by employees designating the labor organization as their representative. (4) Limited enforcement power In the case of a law described in section 3(d)(2), the Authority shall only exercise the authority under section 4 with respect to the categories of public or supervisory employees for whom State law does not substantially provide the rights and procedures described in section 3(b). 8. Authorization of appropriations There are authorized to be appropriated such sums as may be necessary to carry out this Act.