Very interesting.
What right does a brokerage exercise in freezing an individual account at their discretion?
Don't they need authorization from a law enforcing agency to do so?
No, authorization is not needed individually for each case. A brokerage can lock down any account simply on single-party (their) suspicion of any of a list of items. No ruling, no warrant, no third-party. Even if this makes the brokerage liable, the brokerage will invent an excuse to blame the customer.
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