As data-sharing scandals continue to mount, a new proposal in California offers a potential solution: the California Consumer Privacy Act would require companies to disclose the types of information they collect, like data used to target ads, and allow the public to opt out of having their information sold. Now, some of tech’s most prominent companies are pouring millions of dollars into an effort to to kill the proposal.

In recent weeks, Amazon, Microsoft, and Uber have all made substantial contributions to a group campaigning against the initiative, according to state disclosure records. The $195,000 contributions from Amazon and Microsoft, as well as $50,000 from Uber, are only…

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