A lot has already come out on Black's past as a lobbyist (past being up until about a month or two ago), and some of the miscreants for whom he has toiled. But today, The Washington Post has a piece that lists most if not all of these interests:

In addition to Savimbi, Black and his partners were at times registered foreign agents for a remarkable collection of U.S.-backed foreign leaders whose human rights records were sometimes harshly criticized, even as their opposition to communism was embraced by American conservatives. They included Philippine President Ferdinand Marcos, Mobutu Sese Seko of Zaire, Nigerian Gen. Ibrahim Babangida, Somali President Mohamed Siad Barre, and the countries of Kenya and Equatorial Guinea, among others.

Just remember that as the Republicans say, we have gotten our young men and women killed in Iraq to remove a tyrant who butchered his own people. So that they could continue to lobby for other tyrants who have done exactly the same thing.