Colin Kaepernick’s new book, The Perilous Fight, details tensions between the former San Francisco 49ers quarterback, who hasn’t played in the NFL since the 201

Colin Kaepernick’s new book, The Perilous Fight, details tensions between the former San Francisco 49ers quarterback, who hasn’t played in the NFL since the 2016 season—when he knelt during the national anthem to protest social injustice—and Jay-Z, who once called Kaepernick an “iconic figure.” The…