Mikki Sivuyile Mac Millan Xayiya was imprisoned at Robben Island - prison number 46/85 - from 1985 to 1990.
References
• https://blogs.24.com/devilsadvocate22/2010/02/04/remember-this-see-if-your-name-is-not-here/
• Email from Mikki Sivuyile Mac Millan Xayiya to SAHO dated 25 May 2013
• Email from Mikki Sivuyile Mac Millan Xayiya to SAHO dated 25 May 2013