CFR > Title 29 - Labor > SUBTITLE B—Regulations Relating to Labor > CHAPTER XL—PENSION BENEFIT GUARANTY CORPORATION (parts 4000 to 4907) > SUBCHAPTER J—INSOLVENCY, REORGANIZATION, TERMINATION, AND OTHER RULES APPLICABLE TO MULTIEMPLOYER PLANS (parts 4231 to 4281) > PART 4281—DUTIES OF PLAN SPONSOR FOLLOWING MASS WITHDRAWAL > SUBPART A—General Provisions (§4281.1 to §4281.4)