In order to meet its obligations fully, the Commission has investigated each rumor and allegation linking Oswald to a conspiracy which has come to its attention, regardless of source. In addition, the Commission has explored the details of Lee Harvey Oswald’s activities and life, especially in the months immediately preceding the assassination, in order to develop any investigative lead relevant to the issue of conspiracy. All of Oswald’s known writings or other possessions which might have been used for code or other espionage purposes have been examined by either the Federal Bureau of Investigation or the National Security Agency, or both agencies, to determine whether they were so used.[C6-1] In setting forth the results of this investigation, the first section of this chapter reviews the facts related to the assassination itself, previously considered in more detail in chapter IV. If any conspiracy did exist, it might have manifested itself at some point during Oswald’s preparation for the shooting, his execution of the plan, or his escape from the scene of the assassination. The Commission has therefore studied the precise means by which the assassination occurred for traces of evidence that Oswald received any form of assistance in effecting the killing. The second section of the chapter deals more broadly with Oswald’s life since 1959. During the period following his discharge from the Marines in 1959, Oswald engaged in several activities which demand close scrutiny to determine whether, through these pursuits, he developed any associations which were connected with the planning or execution of the assassination. Oswald professed commitment to Marxist ideology; he defected to the Soviet Union in 1959; he attempted to expatriate himself and acquire Soviet citizenship; and he resided in the Soviet Union until June of 1962. After his return to the United States he sought to maintain contacts with the Communist Party, Socialist Workers Party, and the Fair Play for Cuba Committee; he associated with various Russian-speaking citizens in the Dallas-Fort Worth area--some of whom had resided in Russia; he traveled to Mexico City where he visited both the Cuban and Soviet Embassies 7 weeks before the assassination; and he corresponded with the Soviet Embassy in Washington, D.C. In view of these activities, the Commission has instituted a thorough investigation to determine whether the assassination was in some manner directed or encouraged through contacts made abroad or through Oswald’s politically oriented activities in this country. The Commission has also considered whether any connections existed between Oswald and certain right-wing activity in Dallas which, shortly before the assassination, led to the publication of hostile criticism of President Kennedy.