When I was in my twenties and living in NYC, I volunteered at a Catholic Worker house on the Lower East Side. The Workers at Mary House lived with the poorest of the poor, providing food, shelter, health care and other forms of direct aid, while also working for economic justice.
One of those Workers was Kassie Temple. A brilliant writer with a Ph.D., she could have had a comfortable academic career. Instead, she devoted her life to doing what she could to keep hungry and homeless people from starving or dying of exposure to the elements.