The Big Six

The Big Six heroes of Ghana, on all the bills. Can you name them? A hint: the traffic circles in Accra are named after them.
Give up? Nkrumah, Danquah, Ako Adjei. And the three other guys.

Actually, they're not on the 2 cedi bill, which is fairly new. Some rumors about the current president (Atta Mills) not wanting to put the father (Edward Akufo-Addo) of his rival (Nana Addo Dankwa Akufo-Addo) on the bill.