Who are the persons like Mother Teresa who serve the poor?

At the time of her death, Mother Teresa's Missionaries of Charity had over 4,000 sisters, and an associated brotherhood of 300 members, operating 610 missions in 123 countries. These included hospices and homes for people with HIV/AIDS, leprosy and tuberculosis, soup kitchens, children's and family counseling programs, personal helpers, orphanages, and schools. The Missionaries of Charity were also aided by Co-Workers, who numbered over 1 million by the 1990s.