Alvaro Medina Jurado/Getty Images (NEW YORK) -- A Cuban rapper, who helped write the 2021 Latin Grammy song of the year, reportedly sewed his own mouth shut to protest his alleged mistreatment in a maximum-security prison on the island, according to posts on his social media pages, other Cuban activists and his wife. In a photo secretly taken in prison and posted on his Facebook page, Maykel "Osorbo"—one of dozens of political prisoners the Cuban government has held since widespread protests two years ago this month—is seen flipping off the camera with his lips shut. A second, mo...