; (IV) an employing office, as defined in section 411(c) of title 3, United States Code; or (V) an employing agency covered under subchapter V of chapter 63 of title 5, United States Code; and (ii) engaged in commerce (including government), or an industry or activity affecting commerce (including government). (B) Covered employer (i) In general In subparagraph (A)(i)(I), the term covered employer — (I) means any person engaged in commerce or in any industry or activity affecting commerce who employs 15 or more employees for each working day during each of 20 or more calendar workweeks in the current or preceding year; (II) means a smaller employer, to which the special rule in paragraph (3) of section 3(a) applies; (III) means the Government Accountability Office and the Library of Congress; (IV) includes— (aa) any person who acts, directly or indirectly, in the interest of an employer covered by this clause to any of the employees of such employer; and (bb) any successor in interest of such an employer