Former Guantanamo detainee Omar Deghayes will be urging people to support jailed human rights activists around the world.
Mr Deghayes, from Saltdean, who was freed last December, is taking part in an annual greetings card campaign organised by the Brighton and Hove branch of Amnesty International.
Volunteers and supporters will be in The Lanes, Brighton, asking shoppers to sign Christmas cards which will be sent out to prisoners.
The team will be based at the Friends Meeting House in Ship Street tomorrow from 10am to 5pm.
Will Hoyles from Amnesty International said: “Writing a card is a simple gesture but it can have a huge effect.
“It may seem insignificant but over and over again we are told by prisoners how much strength the support shown by these messages gives them.
“In large volumes they can help in efforts to release these activists as prison guards are embarrassed by the attention their prisoners are getting around the world.”
The group will also be collecting games, pens, packs of cards, clothing and toiletries in aid of the Gatwick Detainees Welfare Group.
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