A lawsuit filed by a manager who lost his job at the Hartford office of Swiss financial services giant UBS AG has turned into a pivotal case that could affect how Connecticut workers are protected by the state’s whistleblower law.

The Connecticut Supreme Court will try to determine whether free speech provisions in the state constitution and a 1983 state law that protects workers from being terminated for reporting possible wrongdoing by their company have been trumped, in some ways, by a 2006 U.S. Supreme Court decision.