As boss of Tammany , he demonstrated liberal credentials when he diversified Tammany 's leadership by naming the first Puerto Rican Manhattan district leader , Anthony Mandez .
As boss of Tammany , he backed Hulan Jack as Manhattan 's first African - American Borough President .
As boss of Tammany , he demonstrated liberal credentials when he diversified Tammany 's leadership by naming the first Puerto Rican Manhattan district leader , Anthony Mandez , and backed Hulan Jack as Manhattan 's first African - American Borough President .