A study by the US Federal Trade Commission said the industry collects vast amounts of potentially sensitive data on ethnicity, income, religion, political leanings, age, and health conditions, with little accountability.
"You may not know them, but data brokers know you," FTC chairwoman Edith Ramirez said in a conference call with media.
"They know where you live, what you buy, your income, your ethnicity, how old your kids are, your health conditions, and your interests and hobbies."
"This is an industry that largely operates in the dark," Ramirez said.
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"Most consumers have never heard of the data broker industry, let alone the names of even the largest data brokers."
Ramirez said Congress should consider rules that allow consumers to use a central database to find information being gathered and to correct misinformation.
"Data brokers collect and store billions of data points about nearly every US consumer, which they use to compile extensive profiles about us," the FTC chief said.
Ramirez said the recommendation "would not limit the ability of data brokers to continue to provide important products and services," which she said can "benefit businesses, consumers, and our economy more generally."
The nine data brokers studied by the FTC were Acxiom, Corelogic, Datalogix, eBureau, ID Analytics, Intelius, PeekYou, Rapleaf, and Recorded Future.