Aides to Sen. Marco Rubio, R-Fla., have been privately briefing some financial analysts on the progress of federal immigration law reform and its likely consequences for businesses and investors. The provision of potentially market-moving information to small groups of well-connected individuals is the latest example of the activities of "political intelligence" firms that are attracting increased scrutiny in Washington, D.C. Legal experts say what these people are doing doesn't violate any law.

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