King ya sami lambar yabo ta Nobel ta zaman lafiya a ranar 14 ga Oktoba, 1964 don yaƙar rashin daidaito na launin fata ta hanyar juriya mara ƙarfi. A shekara ta 1965, ya taimaka wajen shirya Selma zuwa Montgomery marches. A shekara mai zuwa, shi da SCLC sun ɗauki motsi zuwa arewa zuwa Chicago don yin aiki a kan gidaje masu rarrabuwa. A cikin shekarunsa na ƙarshe, ya faɗaɗa hankalinsa don haɗawa da adawa da talauci da Yaƙin Vietnam. Ya nisantar da yawancin abokan haɗin gwiwar sa na sassaucin ra'ayi tare da jawabin da aka yi a 1967 mai taken "Beyond Vietnam". J. Edgar Hoover ya dauke shi mai tsattsauran ra'ayi kuma ya sanya shi abin dubawa na FBI daga 1963 zuwa gaba. Jami'an FBI sun binciki shi don yiwuwar alaƙar kwaminisanci, sun yi rikodin alaƙar da ke tsakanin maza da mata kuma sun ba da rahoto ga jami'an gwamnati, kuma a wani lokaci sun aika wa King wasikar barazana, wanda ya fassara shi a matsayin ƙoƙarin kashe kansa Tambaya: Wane irin zanga-zanga King ya yi?
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