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> And if not they are illegal, no

Usually not, no. At least not until lawfully ordered to disburse.

It depends where you are and the circumstances. You certainly need a Parade Permit if you will be marching down a city street blocking traffic, e.g, for New York City: https://www.nyc.gov/site/nypd/services/law-enforcement/permi...

Even then, it isn't often enforced. A few times a year people walk out into freeways in groups to shut down traffic and get at most a slap on the hand for it.

This isn't a statement about these specific protests (that I'm not informed enough about) but don't you find "registering" a protest at least a little bit laughable?