Click here to access article by Paul Craig Roberts from his blog.
Roberts provides and excellent review of Kennedy's opposition to the deep state that had been constructed after WWII to transfer control from the official capitalist government into an invisible government consisting of top capitalist figures in banking and corporations and using the new secret agencies to conduct activities that were illegal or that Americans would not support. Thus Kennedy, and others who stood in the way of this invisible government, had to be assassinated. However Roberts' focus is largely limited to the foreground of Kennedy's assassination and misses the greater significance of this new deep state: the emergence of neo-fascism to replace the capitalist version of democratic institutions of government. The latter became a facade while the former has taken control of all important decisions.