I might be stretching the definition of legal: After a big project (the DAO) was hacked a group of governing people ruled in something similar to a court ruling

I might be stretching the definition of legal: After a big project (the DAO) was hacked a group of governing people ruled in something similar to a court ruling that the money should go back to the people who put it in. Enforcement was done by having everyone agree that the money doesn't belong to the hacker anymore. Though you can't convince everyone that "people are the law" in a system where "code is law". Which is why the Ethereum network split and people who refuse to agree stick to something called Ethereum Classic (an alternate reality where the hackers still own the funds).