David Belin had started his work for the Warren Commission believing that President Kennedy's killing was probably the work of a conspiracy. The commission's investigations changed his mind, and he makes his case persuasively-adding, under prodding from WFB, that "I in no way want to say that Castro was involved with the assassination of President Kennedy, but it is curious to me that with all the current furor about possible conspiracies, the most obvious one is cast aside on grounds that Castro was sincere when he said he wasn't involved."