South African firebrand opposition politician Julius Malema says he has been denied a visa to attend a conference in the UK in May.
Malima said the UK had no substantial justification for the decision and he saw it as an attempt to silence the dissenting political perspective.
In a leaked letter to Malema's deputy, the UK High Commissioner to South Africa, Antony Phillipson, said the Home Office had been unable to process his visa application in time for his trip.
Malema, the leader of the Economic Freedom Fighters (EFF) party, is a fierce critic of what he sees as "Western imperialism", and also advocates the nationalisation of white-owned land in South Africa.