N'ọnwa Jenụwarị afọ 1931, Walker gara njem nleta na Soviet Union, ebe ọ gara ụlọ akwụkwọ International Lenin School dị na Moscow. Ọ laghachiri Australia na March 1933 ma gbanwee aha ya gaa na Richard Dixon ná mgbalị izere ndị ọrụ nche, bụ́ ndị kpọrọ ya "onye mgbanwe dị ize ndụ". Ọ ghọrọ odeakwụkwọ ukwu nke CPA na 1937. Na 25 Machị 1939 ọ lụrụ Dorothy Jean Button n'ụlọ ọrụ ndebanye aha na North Sydney. A họpụtara ya onye isi oche mba nke CPA na 1948. N'afọ 1945 ọ wakporo iwu White Australia dịka nke agbụrụ na nke na-akpasu iwe, ọ nọchitekwara anya CPA na Petrov royal commission na 1954. Ọ bụ ezie na ọ na-eguzosi ike n'ihe nye Soviet Union, o kwenyere na nnwere onwe nke CPA na 1960s ma ekwenyeghị na mbuso agha nke 1968
nke Czechoslovakia. Dixon lara ezumike nká dịka onye isi oche mba nke CPA na 1972 ma nwụọ na 1976 nke ọrịa obi na-arịa ọrịa na Bankstown.