"Humanitarian work" refers to activities that are done to help improve the lives and well-being of people who are suffering or in need. Full definition
According to the code of conduct to which humanitarian organizations subscribe, respect for human dignity is the number one priority of humanitarian work. (blog.politics.ox.ac.uk)
I want to do humanitarian work with it, mostly. (nakedpastor.com)
Visitors to the island must fit one of 12 criteria, including travel to visit family, conduct journalism, perform humanitarian work, or participate in an educational tour. (fortune.com)