Hani later became MK second-in-command and Modise's rival for the top job, as well as being vastly popular in MK and in South Africa. He was viewed as Mbeki's most plausible rival to succeed Tambo.
Johnson considers the evidence that Modise was a double agent "overwhelming", citing former apartheid security policemen he interviewed.
Modise returned to South Africa in 1990 "determined to become the first ANC defence minister" and "began to meet with foreign arms dealers now swarming the country in search of the inevitable post-sanctions arms deal".
Johnson writes that in 1993 Hani confronted Modise with the knowledge that he (Modise) had sold off an ANC arms cache for R2.5-million and pocketed the money. "Two weeks later Hani was shot dead."
Interesting stuff, it was always known Modise was a thug.
http://www.mg.co.za/article/2009-03-29-hani-not-yet-laid-to-rest