According to Levy Gorvy International art gallery, "KEITH HARING's seminal Silence = Death (1988) was painted the year the artist was diagnosed with AIDS. In the final year of Haring’s life, his work centered on social activism, and this painting adapts the pink triangle featured in a 1987 poster produced by the Silence=Death collective, and popularized by the organization ACT UP. Haring overlaid the triangle with figures acting out the pictorial maxim 'See no evil, Hear no evil, Speak no evil,' alluding to the Reagan administration’s refusal to acknowledge the AIDS epidemic."
Link to an 1982 interview of Haring by Charles Osgood of CBS News Sunday Morning fame.
The Economist's 1843 Magazine articl by Tim Smith-Laing "How Keith Haring’s Art Forced Us to Talk About AIDS."
Link to the Walker Art Center (in Minneapolis) article "The Political Provocations of Keith Haring." The site has links to online versions of two past Haring exhibits.