Section 365 of the Bankruptcy Reform Act authorizes one in bankruptcy to "assume or reject any executory contract ...of the debtor." The most frequent use of the section arises when a lessee goes into Chapter 11 and decides either to reject its real estate lease with its lessor or, if the lease is at a favorable rental rate, to assume it and assign it to another. A less frequent but more controversial use of section 365 is to reject one's collective bargaining agreement with his employees.
White, James J. "The Bildisco Case and the Congressional Response." Wayne L. Rev. 30 (1984): 1169-204.