A Group Security Contact (GSC) is created by a Department Security Contact (DSC) when a separation of responsibilities is needed. Each DSC will have an orgnode set, and the GSC will be associated to the department via its parent, the DSC.
A Group Security Contact can be used to help departments separate devices into sets that receive (or do not receive) IT support from a Service Provider Security Contact (SP SC). Additionally, when responses to security incidents is the responsibility of different groups (e.g., a research lab within a larger department, student systems vs. an administrative one) a DSC can create a GSC to receive targeted notices.