The Supreme Court case Green v. Brennan is significant because it clarified when the filing period begins for a workplace discrimination complaint under Title VII of the Civil Rights Act of 1964. The Court held that the filing period starts when the employee resigns, not on the effective date of the resignation. This means that the 45-day period for contacting the Equal Employment Opportunity Commission (EEOC) in a constructive discharge action does not start until the employee has actually resigned, since the resignation is an integral part of the cause of action. This decision provides more clarity and protection for employees who may face constructive discharge, as they now have more time to file a complaint with the EEOC after resigning from their position.