On an August morning in 2014, someone noticed a black flag hanging outside a rundown duplex in suburban New Jersey. He could not make out its Arabic, but he recognized the design from horrific news reports about ISIS, in which masked jihadists fought under the banner to realize their dark vision of God’s rule on earth. Alarmed, the passerby sent a picture of the house and its flag to a friend, who promptly tweeted it and informed the Department of Homeland Security.
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