authors suggest that newly declassified documents increase the credibility of his claims. See also John Anthony Walker Further reading Notes Footnotes References External links Dieter Gerhardt (Translation) Operation Felix (Translation) German emigrants to South Africa Naturalised citizens of South Africa People from Berlin South African people of German descent South African Navy personnel South African spies for the Soviet Union South African people convicted of spying for the Soviet Union 1935 births Living people Admitted Soviet spies Israel–South Africa relations GRU officers 1983 in international relations 1983 in South Africa People convicted of treason Opposition to apartheid in South Africa Cold War military history of South Africa Naval attachés