Tax protester Richard Simkanin, who had been sentenced to seven years in prison, has died of poor health conditions in a Texas prison.
Simkanin, 67, had served seven years in a federal prison after refusing to withhold taxes from his employees at his Bedford, Texas plastics business and not filing income tax returns for himself.
He argued that federal income tax does not apply to domestic incomes.
Simkanin had been released from prison earlier this year, but was jailed again after officials claimed that he violated his terms of release.
Tax protests are common in the United States. More than 2,100 people were convicted of tax violations in fiscal year 2007 alone.
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