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The app Truecaller estimates that as many as 56 million Americans have fallen foul to scam calls, losing nearly $20 billion. \n\nEnter L., an anonymous vigilante, referred to here by his middle initial, who seeks to expose and disrupt these scams, posting his work to a YouTube channel under the name \u201cJim Browning.\u201d\n\nOn today\u2019s Sunday Read, Yudhijit Bhattacharjee follows L.\u2019s work and travels to India to understand the people and the forces behind these scams.