The "blood sucking" metaphor is just stupid.
Presumably the people in the black communities in which Jewish and Korean storeowners do business obtain some value from the money ("blood") they are spending. If not, why are they spending it? Are Jewish and Korean vampires glamoring the locals and making them give up their money for nothing in return?
While you can make a case that it might be good for business and their self-interest, if Korean and Jewish storeowners invested some of their profit in the health of the communities in which they operate, what legal or moral obligation are they under to do so?
The answer is simple: None.
They pay taxes which, theoretically, will find their way into the black communities. If you don't think they are, you have a problem with your governments, not the storeowners.
Why should they pay an additional premium for the privilege of providing the community with goods and services it needs and desires?
Are you and Farrakhan suggesting the Jewish and Korean shop owners are somehow taking advantage of the black communities and price gouging or selling defective goods?
The fact of the matter is that there is a reason why Jewish and Korean storeowners operate in black communities to an extent where their numbers have created identifiable groups: A lot of other shop owners left and don't want to come back.
You can label this racism but if black communities were unusually favorable to merchants there would be a flood of new businesses opening, and if they were simply as hospitable as any other communities they wouldn't be serviced only by hard scrabble, tightly knit ethnic groups that have found a way to adapt to the environment.
Your leaders who attempt to "enlighten" you by turning your greatest plague - racism - against other groups are not helping you.
The Jews and Koreans in black communities have not formed organized crime syndicates. If other business want to operate in your community they can; the Koreans and Jews will not firebomb their stores. Which means black owned businesses can operate in black communities. I've no doubt that this is the already the case, but what your leaders should be doing is "enlightening" more of you to the ways of education, hard work and capitalism so that if you don't want to, you won't have to depend upon businesses without roots in your community, and so you will have the means to serve and profit from your neighbors and, if you desire, give something more back to them.