After nine years inside the youth wing of the African National Congress, Loyiso Tyiro has had enough. Sipping an apple juice in a trendy Johannesburg cafe, Mr Tyiro, a computer engineer of 30, reels off a list of complaints, condemning the shift in South Africa’s governing party since the sometime populist Jacob Zuma won control of the organisation at the end of last year.

“A lot of us professionals have been beginning to feel out of place for some time,” says Mr Tyiro, who this weekend will throw his lot in with a more moderate party being formed by some of Mr Zuma’s opponents in the party. “If you don’t toe the Zuma line you feel that you can’t make a meaningful contribution.”