They usually intersect, but not all the time. Asian immigrants for example can be medically underserved, but they wouldn't experience social justice that badly like "police profiling". This is an extreme example, of course. And like I said, they usually intersect.
while they lean to medically underserved, having worked with other groups such as at-risk youths, immigrants, homeless, etc, that is as acceptable and is sought out by adcoms