The Supreme Court will decide whether a business and a union's agreement is valid after the business helped the union organize in return for help with a ballot initiative.

The high court agreed to hear appeals from UNITE HERE Local 355, which wants to challenge a ruling saying its deal with Hollywood Greyhound Track, Inc., known as Mardi Gras Gaming, may be illegal.

The union agreed to help the company win a gambling ballot initiative legalizing slot machines at racetracks and said it would not picket, boycott, or strike. Mardi Gras officials agreed to give the union employee addresses, access to the facility and not ask for a secret ballot election on unionizing.

Labor law says companies cannot give unions that want to represent employees something of value.