OTOH, here’s an article claiming he was imprisoned and tortured.
http://www.theguardian.com/world/deadlineusa/2008/dec/03/obama-grandfather-maumau-torture
Noticed a couple major flaws in this story, however. It claims he was arrested in 1949 for being associated with the Mau Mau and imprisoned and tortured for two years.
The Mau Mau didn’t start up till 1952.
Obama gramps was a Luo. The Mau Mau were very, very exclusively Kikuyu. Doubt he would have been allowed to join.
This article also contains no actual evidence any of this happened to Obama, as opposed to others.