Final answer:
Community psychologists play an important role in carrying out responsibilities for people who are chronically mentally ill in community-based programs.
Step-by-step explanation:
The group that plays an important role in carrying out responsibilities for people who are chronically mentally ill in many community-based programs is community psychologists. Community psychologists work with individuals and groups to develop interventions and shift social systems towards positive outcomes. They collaborate with medical health professionals, social workers, and other professionals in the social service sector to provide comprehensive care and support.