Facebook Inc. removed Trump campaign ads that referred to a census, saying they violated a company policy aimed at preventing disinformation and other interference with the nationwide 2020 census, which goes online next week.

The ads, which began running on the social network this week, asked people to take the “Official 2020 Congressional District Census” and then directed users to a website for fundraising to support Mr. Trump’s reelection. “The information we gather from this survey will help us craft our strategies for…

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