National social service association is the largest social service association in the world, clinical social work association
Step-by-step explanation:
There are five professional organisations of social worker. national association of social workers, clinical social work association, international federation of social workers, society for social work and reteach, Network for social work management.
National social service association is one of the ;largest social service organisations with more than 132000 members registered. It is in America where it continues its services in both private and public sectors. clinical social workers organisation is the licensed social network organisation which focuses mainly in the mental health of the destitute by having tie ups with local health care bodies.