Those "interested in the truth, rather than nasty smears" should read chapter 13 of Leon's book, said former chief whip of the opposition Douglas Gibson.
The country's largest opposition party is holding its congress this weekend. Its grappling with some pretty fundamental issues.
The DA is changing rapidly as the party looks to shed the past, say insiders.
'It's not ideal to have a serious discussion on colonialism in 140 characters.'