Christopher Andrew, "KGB Foreign Intelligence from Brezhnev to the Coup"', in: Wesley K. Wark (ed), Espionage: past, present, future?, Routledge, 1994, p. 52: "One recently declassified document of 1969 describes the work of five KGB agents on the WCC Central Committee and the appointment of another to a 'high WCC post'. A similar report from 1989 claims that, as a result of agent operations to implement 'a plan approved by the KGB leadership', the WCC Executive and Central Committee adopted public statements (eight) and messages (three) which corresponded to the political course of Socialist [Communist] countries'. While it would be naive to take such boasting entirely a face value, there can be little doubt about the reality of Soviet penetration of the WCC."
John Gordon Garrard et al., Russian Orthodoxy Resurgent: Faith and Power in the New Russia., p. 37 f. Google books preview here [1].