There's a precedent: NOW vs. Terry. Randall Terry organized nationwide to recruit and help people in blocking abortion mills with their bodies—violating laws against trespass—and keep the facilities from killing babies that day. He even solicited and received donations for that purpose. He was sued under RICO, the racketeering statute.
The baby-killers lost. The Court ruled the merely organizing and encouraging an illegal activity in itself didn't qualify as being a "Racketeer-Influenced and Corrupt Organization." The lack of monetary gain was fatal to the "corrupt organization" claim, since the objective was obviously in the realm of "speech" (policy).
Use RICO to defund Planned Parenthood and I don’t just mean the half billion in taxpayer dollars. All of the ill gotten gains too.