I understand your post but not everyone is defined by their "tribe" http://www.foreignaffairs.com/articles/54995/gail-m-gerhart/bram-fischer-afrikaner-revolutionary
I happen to know a number of people who were in the SACP in the 1950s and early 1960s who would be interested to see your "compelling evidence". It's certainly true that the ANC and SACP worked very closely together - the simple reason being that the SACP was the only party from 1948 onwards...