We will need to find a way to out the Federal agents. This is a quick unresearched thought. Make it a State sanctioned organization, supported by the State police and county Sheriffs.
OSINT = Open Source Intelligence and is how the left doxxes conservatives. That and they have people on the inside because much of the bureaucracy is mostly leftists because they have a personality that draws them to positions of control over other people. That and they get into those positions for Viva La Revolution.
An anonymous member website like FR would not be the thing to use for activism due to the risk of leftist infiltrators. True The Vote has another project for cleaning up the voter rolls, I3V. To join, you need to upload a Gov issued ID. The left has a “non-profit” to help local election officials “run” their elections. You request help and they decide who to help. I imagine they target purple districts so they can turn them blue.