 Diggs also argued that American corporations were propping up the apartheid government through their investments, and he was banned from South Africa for these positions.Diggs was additionally a founding member and the first chairman of the Congressional Black Caucus, a group of African American representatives and senators working to address the needs and rights of black constituents.While chairman, Diggs successfully led a caucus boycott of President Nixon's State of the Union Address, following Nixon's refusal to meet to discuss issues relevant to African Americans.