WASHINGTON — The last time Senator Amy Klobuchar, the Minnesota Democrat, sat in the majority, her party was fawning over Silicon Valley. Lawmakers praised the ingenuity of Facebook and Amazon, while President Barack Obama and regulators fought alongside Google and Twitter to protect the growth of internet businesses.
Now, many of those same politicians are gearing up to tame those companies. And Ms. Klobuchar, who leads the Senate panel overseeing antitrust, is expected to play a leading role…

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