15 U.S.C. § 80a: Proxies; voting trusts; circular ownership

It shall be unlawful for any person, by use of the mails or any means or instrumentality of interstate commerce or otherwise, to solicit or to permit the use of his name to solicit any proxy or consent or authorization in respect of any security of which a registered investment company is the issuer in contravention of such rules and regulations as the Commission may prescribe as necessary or appropriate in the public interest or for the protection of investors. It shall be unlawful for any registered investment company or affiliated person thereof, any issuer of a voting-trust certificate relating to any security of a registered investment company, or any underwriter of such a certificate, by use of the mails or any means or instrumentality of interstate commerce, or otherwise, to offer for sale, sell, or deliver after sale, in connection with a public offering, any such voting-trust certificate. beneficially owns more than 3 per centum of the outstanding voting securities of one or more other companies of the group; and has more than 3 per centum of its own outstanding voting securities beneficially owned by another company, or by each of two or more other companies, of the group. If cross-ownership or circular ownership between a registered investment company and any other company or companies comes into existence upon the purchase by a registered investment company of the securities of another company, it shall be the duty of such registered company, within one year after it first knows of the existence of such cross-ownership or circular ownership, to eliminate the same.