While social services work addresses the needs of individuals, social action looks more at the root causes of those needs and tries to find ways to eliminate them. For example, rather than working directly with the homeless, a social activist might work to uncover the conditions that are making it difficult for people to work and afford a place to live. Instead of serving in a clinic that sees a high incidence of leukemia, the social activist works to uncover the source of toxic chemicals and to hold polluters accountable for the increased health risks to a neighborhood.
If we define social justice as the belief in an equitable, compassionate world where difference is understood, valued and respected, then we can see that social activism and social justice are flip sides of the same coin. Social action work is a way to meet the goal of social justice