activism african-american africanamericanpolice africanamericans biography civil-rights-movement colorado-springs discrimination equality hate-groups hatecrimes infiltration ku-klux-klan kukluxklan(1915-) law-enforcement memoir newyorktimesbestseller police police-department race-relations racerelations racial-identity racism social-justice true-story undercover-agent undercover-investigation undercoveroperations unitedstates white-supremacy whitesupremacymovements