To intimidate. They're probably quite aware they'll lose in court. But in the mean time they might discourage some folks from turning out on the street.

Are you under the impression that the current administration cares about what the law says?

"Conservatism consists of exactly one proposition, to wit: There must be in-groups whom the law protects but does not bind, alongside out-groups whom the law binds but does not protect"

They're "investigating", presumably with data gleaned from arrests and CIs; you have a right to speech, and a right not to be prosecuted for speech, but a much, much narrower right not to be "investigated", collapsing to ~epsilon when the investigation involves data the FBI already has.

When has the constitution mattered to this administration?

Because too many people dismissed the claims that electing Trump would lead to a fascist administration as alarmist. Turns out he meant every word he said during his campaign.

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Conspiracy to commit a crime is typically not included in protected speech. Whether you think that's happening here will depend mostly on what side you take, I suspect.

Federal felony, not free speech.

18 U.S.C. § 372 - Conspiring to impede or interfere with a federal officer

Coordinating roadblocks, "dearrests", warning the subjects of law enforcement operations, and intentionally causing the maximum amount of noise in neighborhoods neighborhood are not things you will be able to get a federal judge to characterize as "constitutionally protected speech".