MOUNTAIN VIEW (AP) — Nine privacy, social justice and consumer groups are calling for the U.S. government to block Google’s $2.1 billion acquisition of San Francisco fitness-gadget maker Fitbit, citing antitrust and privacy concerns.

They say in a Wednesday letter to the Federal Trade Commission that the deal would consolidate Google’s dominance over internet services like search, advertising and smartphone operating systems.

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They also worry it’ll add to Google’s store of consumer data. Health information is of particular concern. Google, headquartered in Mountain View, has hired health care executives, hinting at a health-data business to come.

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Politicians and regulators have been scrutinizing Google and other Silicon Valley companies for how they use customer data and leverage their size to thwart competitors.

Google didn’t immediately respond to a request for comment.

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