https://docs.google.com/document/d/1OlRrrm2fkk7sjKyRiTwxrdBKQY58eIooc62_OtWsKRs/edit
This is our working document of best practices for writing to comrades inside (especially former sex working/trading comrades who are criminalized survivors).
See also the amazing resource that Survived & Punished has debuted around organizing your own letter writing events: https://survivedandpunished.org/toolkit-for-organizing-letterwriting-events/