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He dealt with his internment without trial in the 1970s and the 1981 Republican hunger strikes, by which time he was Sinn Féin vice president.

He was detained in the early 1970s when the government in Northern Ireland introduced internment without trial for those suspected of paramilitary involvement.

It was last invoked in World War Two, when people of Japanese descent were imprisoned without trial and thousands sent to internment camps.

It's the law that President Franklin Roosevelt used to justify the Japanese internment, the darkest moment of his otherwise illustrious presidency.

Mr Adams was detained in the early 1970s when the government in Northern Ireland introduced internment as violence spiralled in the early years of the Troubles.