NATICK – A Natick man ran an online messenger group dedicated to sharing child pornography with an iron hand, demanding daily uploads of photos and videos depicting children in sexual situations and kicked people out of the group if they did not follow through, authorities say.Federal authorities arrested Francis Castellino, 19, at his 83 Pine St., home on Monday after an 11-month investigation into an online chat group that Castellino ran on the messaging social media site, [...]
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