Some Pennsylvania voters have received letters publicising whether they had voted in previous elections before they head to the polls on Tuesday.
The letters appeared to be intended to "embarrass" people into voting by revealing their voting record compared to that of friends and neighbours.
The letter, published by local news site Lancaster Online, does not show who an individual voted for in each election, but reveals whether or not they voted in the last three elections.
The note also stated that after the 15 May election, the group will mail an updated chart so that "you and your friends, your neighbours, and other people you know will all know who voted and who did not vote".
The elections will be closely watched after the state's Supreme Court threw out a Republican-favoured congressional map and imposed one expected to help Democrats in November's mid-term elections.
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