What are major events in the 20th century concerning police and minority relations?

Im helping my friend with her sociology paper. her idea is to find articles about major events in 20th century concerning police and relations with minorities. For example, for the 1990s Rodney King & the L.A. Riots. For 2000s, post-9/11 racial profiling. What about other decades in the 1900s?

The 1960s-1970s are also an important period to look at, the uprisings in Watts and Newark being major examples. The Black Panther Party dealt a lot with this issue.