Mahatma Gandhi supported the resolution of the African People's Organisation (APO) to declare the day of arrival of the Prince of Wales in Cape Town as a day of mourning, in protest against the South Africa Act's disenfranchisement of Indians, Coloureds and Africans in the upcoming Union of South Africa.

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Sources:

http://www.sahistory.org.za/pages/chronology/general/1910s.html

http://www.anc.org.za/ancdocs/history/people/gandhi/anil.html