Please post your data so when someone says, “What do you mean black leaders demanded harsher penalties....”, we have some ammo. Thank you.
Anyone can search it. Here are two examples. The second article is more comprehensive, but the Slate article shows that even the left partially acknowledges the truth.
http://www.slate.com/articles/news_and_politics/crime/2016/02/why_many_black_politicians_backed_the_1994_crime_bill_championed_by_the.html
http://prisontime.org/2013/08/12/timeline-black-support-for-the-war-on-drugs/