In 1990, Nelson Mandela famously touched down in Harlem alongside Winnie Mandela just months after his release from prison. An indelible connection formed over a shared struggle between Black New Yorkers living above 110th Street and South Africans living under apartheid rule thanks to the visit. The spirit of that connection continued July 17 as roughly 25 volunteers from the Mandela Foundation, the United Nations, and city government served l…