It is widely argued by mainstream historians that the Communist Party, USA (CPUSA) became a marginal political force post-1956. According to some, it was a “shattered organization” afflicted with a “mortal illness” struggling to survive as its “membership plummeted.” Tony Pecinovsky challenges this narrative in his new book. Through political biographies of CPUSA leaders, Pecinovsky highlights the various ways in which Communists continued to play an important—if largely neglected by historians—role during the second half of the 20th century and into the 2000s. Let Them Tremble focuses on Communist activity and analysis during the 1960s youth and student upsurge, the birth of the National Alliance Against Racist and Political Repression (NAARPR), the National Anti-Imperialist Movement in Solidarity with African Liberation (NAIMSAL), as well as Changing America, a public access TV show, among other examples.