A bipartisan group of political operatives — spanning the ideological spectrum from former members of the hard-right House Freedom Caucus to a Democrat who challenged Representative Marjorie Taylor Greene of Georgia — has started a political action committee aimed at “stopping MAGA” and eradicating what the operatives call an authoritarian streak among some Republican lawmakers. The group, Mission Democracy PAC, will challenge far-right members of Congress in their often deep-red home districts, running ads and messaging campaigns that accuse the politicians of holding antidemocratic and extreme positions. Mission Democracy PAC begins with just over $500,000 in the bank, but the advisers say they hope to raise $18 million for the coming election cycle, and plan to spend all of it within the targeted congressional districts. Who’s behind the group? The leaders are former Representative Denver Riggleman of Virginia, who once belonged to the Freedom Caucus but has since left the Republican Party and spoke out against conspiracy theories from the House floor; Olivia Troye, a former official in Donald J. Trump’s administration who has been critical of him; and Marcus Flowers, an Army veteran and Democrat who lost heavily to Ms. Greene last year.

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