Many, many far-left extremist groups are registered nonprofits in the U.S. that receive taxpayer funded grants or cash injections by benefactors. The public is quite ignorant about how well organized and funded the far-left are.
We the public are ignorant about it because it has been done quietly behind the scenes for decades, now the light is shining on it by ppl such as yourself, so we see it and learn how it all works!