Former Labour Cabinet minister Patricia Hewitt has said the National Council for Civil Liberties (now Liberty) was "naive and wrong" to accept the claims by the Paedophile Information Exchange that it was a campaigning and counselling organisation.
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Mladic, now 75, was the military commander of Bosnian Serb forces in the 1990s, who fought against the Bosnian Croat and Bosniak armies.
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His representatives said Cassidy, who was hospitalised last week, died "surrounded by those he loved."