Despite patriotism what discrimination did African-Americans face during World War 2?

During World War II signs were put out, such as "help wanted, only whites", FDR fixed this problem, afraid otherwise it would feed Hitler's propoganda march. Roosevelt forced business employers to stop discrimination in hiring, but with a lot of people receiving jobs in cities, there was scarce housing and riots broke out leading to angry incidents. Also, African Americans serving in the war were in all black units, and were commanded by a white officer.