Barbara Castle was President of the Anti-Apartheid Movement from 1962 to 1964. She organised a vigil at the 1961 Commonwealth conference at which South Africa was forced to leave the Commonwealth.
This is a clip from an interview for the film series ‘Have You Heard from Johannesburg?’, covering the 50-year history of the global anti-apartheid movement. The series is a Clarity Films production, produced and directed by Connie Field. See http://www.clarityfilms.org/haveyouheardfromjohannesburg