Federal authorities allege that a Halethorpe man used the internet to extort minors playing on Roblox into performing sexual and violent acts as part of his involvement in an online “nihilistic violent extremist” group.

The basis for the cyberstalking, online coercion and sexual exploitation charges against Erik Lee Madison, 20, are laid out in a disturbing, 49-page affidavit unsealed Friday in Maryland’s federal district court. An FBI agent concluded in it that Madison was behind a Roblox profile giving gruesome orders to minors he met online. The profile told minors to perform sex acts on camera, cut themselves and use their blood to write on a wall. It also ordered one teenager to kill her sister’s dog, but she refused to do so.

Sometimes the young victims would be rewarded with in-ga

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