There are strict rules, but you can write letters (not cards) to these two political prisoners.
Please write (using white paper only!) to the US whistleblower:
Chelsea Elizabeth Manning, A0181426, William G. Truesdale Adult Detention Center, 2001 Mill Road Alexandria, VA 22314, USA.
(No cards, postcards, photocopies, books, magazines or cash, and no decorations on the – white – envelope!) More info: www.xychelsea.is.
Please also write to:
Mr Julian Assange, DOB: 3/07/ 1971, HMP Belmarsh, Western Way, London SE28 0EB.
(No cards or postcards. Put your full name and address on the back of the envelope. If you would like him to write back, please include a blank piece of paper with a self-addressed and stamped envelope. No loose stamps!) Info: www.twitter.com/ja_defence