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There is old, secret knowledge being used even today in politics. There is history of secret cults using fabric to bring evil spirits to people.
Not voodoo dolls, but pieces of fabric. They could be used to help demons find "trails" back to people. If someone wanted to become mayor, he might send fabric to villagers so demons could whisper over the shoulder of the one who had the fabric. Like planting subconscious seed to create control of a desired outcome.