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Political organizations.
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Charities, although professional fundraisers must remove your name from the list if you ask.
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Marketing surveys, although beware of sales calls disguised as surveys. This is a common scam used to get around the do-not-call lists.
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Businesses with whom you have had a relationship within the past 18 months. You can ask them to stop calling.
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Businesses that you have asked for information from, or applied to, in the past 3 months. You can ask them to stop calling.