Answer:
Billy Cunningham and the Cougars
The contract was not assignable to another club.
But, the contract (assets and liabilities) can be inherited by a successor entity using the same club, the Cougars.
Explanation:
The contract was not assigned to another club, despite the change of ownership of the Cougars. Interestingly, the contract between Cunningham and Carolina Cougars was inheritable with the change of ownership of the Cougar Club from the formers owners, Carolina Cougars, to the new owners, Munchak Corporation. The clause prohibiting the contract's assignment to another club without Cunningham's consent was not violated.