Any American interested can fill in this form and send it to the IRS on the basis that they're engaged in a revolution against the US, not charity work.
https://www.irs.gov/pub/irs-pdf/f13909.pdf

"In general, no organization may qualify for section 501(c)(3) status if a substantial part of its activities is attempting to influence legislation (commonly known as lobbying). ...
Legislation... does not include actions by executive, judicial, or administrative bodies."
https://www.irs.gov/charities-non-profits/lobbying
They're bypassing the whole congress thing, so it might be legal.
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