Beatings and abuse made Barack Obama's grandfather loath the British: London Times

Quoted via London Times:

Barack Obama’s grandfather was imprisoned and brutally tortured by the British during the violent struggle for Kenyan independence, according to the Kenyan family of the US President-elect.

Hussein Onyango Obama, Mr Obama’s paternal grandfather, became involved in the Kenyan independence movement while working as a cook for a British army officer after the war. He was arrested in 1949 and jailed for two years in a high-security prison where, according to his family, he was subjected to horrific violence to extract information about the growing insurgency. more