Members of the Mau Mau of Kenya, who say they were tortured by the British colonial authorities in the 1950s, are taking their case to the High Court in London.
They say the government has a duty to be open about the crimes it committed against the group during the time of the Mau Mau uprising.
At that time, the group endured torture at the hands of the British and tens of thousands of the people were forced into detention camps.
Now, survivors want the government to take responsibility for its actions.
Al Jazeera's Barnaby Phillips reports from London.