Organized labor spends about four times as much on politics and lobbying as generally thought, according to a Wall Street Journal analysis, a finding that shines a light on an aspect of labor’s political activity that has often been overlooked.

Previous estimates have focused on labor unions’ filings with federal election officials, which chronicle contributions made directly to federal candidates and union spending in support of candidates for Congress and the White House.

But unions spend far more money on a wider range of political activities, including supporting state and local candidates and deploying what has long been seen as the unions’ most potent political weapon: persuading members to vote as unions want them to.

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