If these stories move you, Voice of the Martyrs has a way to be of more direct help. Check out B.A.S.I.C. Fellowship for resources, including lists of those imprisoned to write to. B.A.S.I.C. stands for "Brothers and Sisters in Chains". Remember what Paul said in Hebrews 13:3 (NKJV): "Remember the prisoners as if chained with them--those who are mistreated--since you yourselves are in the body also."
Here in the U.S., at least, international letter (and postcard) mail is cheap and relatively quick. There's no excuse not to take a few minutes and remember one of our brothers or sisters. It could make all the difference to them, whether from the standpoint of morale -- knowing that people remember you, or even in their standard of care. The people who imprison them count on their being forgotten. A reminder that that isn't so can give them better circumstances; maybe even get them released.