Just a heads-up: Everything you post on Lemmy is public, for the entire world to see, including your ip address and username.
So make sure you use a VPN in a friendly foreign country, do not re-use your username anywhere else, and do not post any info about yourself using the same account or IP address. Even so, those guidelines only protect against superficial surveillance.

For actually organizing resistance, a platform that offers privacy and encryption would be better suited.