What did Khalid contribute to Wikipedia? What crimes is he accused of?> I clicked through to the Signpost article from 16 January, but it doesn't say.

It's hard to say what exactly caused his persecution. He did upload a few pictures of human rights activists to Wikimedia Commons, almost a decade prior.

Wikipedia actually has a (most likely very incomplete) list of people imprisoned for editing Wikipedia:

https://en.wikipedia.org/wiki/List_of_people_imprisoned_for_...