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Last week, I testified in a congressional hearing on the subject, which ended up being a strongly bipartisan discussion of an underexplored privacy problem that affects hundreds of millions of Americans. U.S. data brokers surreptitiously gather and sell personal information ranging from people’s health and mental health conditions to their income and credit score, political affiliation, and smartphone locations. For example, Arkansas-based data broker Acxiom advertises data on 2.5 billion people worldwide.