update: Here's racismreview discussion, and via racismreview Information on the 1946-1948 United States Public Health Service STD Inoculation Study
Yeah, an academic article is coming out soon by Susan M Reverby (synopsis in pdf) who found that the US infected Guatemalans with syphilis and gonorrhea during the 1940s. Kinda like the Tuskegee experiment (update: different link via racismreview) for Latin America.
Now, don't get me wrong. This has nothing to do with AIDS in the black community and whether or not the US government invented AIDS. But the conspiracy theory doesn't sound so far fetched now.