In 2004 TDA (then Ameritrade) raided their own customers' accounts (IMO - of course) by permitting a DNS attack and executing margin calls when the market was dramatically run down and then back up in the space of a few hours while retail customers were unable to access their accounts.
The nature of the problem was never discussed in the WSJ and although I personally reported the attack and the URL of the test of the system on a California ISP prior to the attack to Ameritrade, the SEC and the FBI - nothing was done.
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