In 1968, Martin Luther King gave his final major public speech, in which he praised the work of Sean O’Casey. This chapter highlights the way in which O’Casey’s work proved attractive to Black activists, pointing to the comments he made about race in his letters and autobiographies, and highlighting the way in which Black actors in New York began to perform in O’Casey’s drama in the mid-twentieth century. The chapter also draws attention to the way in which figures such as Harry Belafonte and Lorraine Hansberry felt inspired by the Dublin playwright’s work.