POSNER, Circuit Judge.
The Commodity Futures Trading Commission issued subpoenas directing the appellants, Thomas Collins and others, to produce copies of their federal income tax returns for the scrutiny of the Commission's staff, which is investigating the appellants for possible civil violations of the Commodity Exchange Act, 7 U.S.C. §§ 1 et seq. Among the suspected violations is the trading of commodities futures contracts other than on
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