Final answer:
An organization not fulfilling its promise of long-term career opportunities due to restructuring breaches the psychological contract, which is the implicit expectations between an employer and employee.
Step-by-step explanation:
When an organization has promised long-term career opportunities to its employees but fails to fulfill this promise due to organizational restructuring, this can be considered a breach of a psychological contract. A psychological contract refers to the unwritten, implicit expectations and promises between an employer and employee beyond the formal, tangible employment contract. This breach occurs when the implied agreement about job security and career advancement is broken, leading to potential demotivation and trust issues within the workforce.