29 U.S. Code § 1414 - Asset transfer rules
(a) Applicability and scope
A transfer of assets from a multiemployer plan to another plan shall comply with asset-transfer rules which shall be adopted by the multiemployer plan and which—
(1) do not unreasonably restrict the transfer of plan assets in connection with the transfer of plan liabilities, and
(2) operate and are applied uniformly with respect to each proposed transfer, except that the rules may provide for reasonable variations taking into account the potential financial impact of a proposed transfer on the multiemployer plan.
(b) Exemption of de minimis transfers
The corporation shall prescribe regulations which exempt de minimis transfers of assets from the requirements of this part.