Question: Which tax protester did Kevin Henke call on the phone?

Context paragraphs:
Kent Hovind: Kent E. Hovind (born January 15, 1953) is an American Christian fundamentalist evangelist and tax protester.  He is a controversial figure in the Young Earth creationist movement and his ministry focuses on attempting to convince listeners to deny scientific theories in fields including biology (evolution), geophysics, and cosmology in favor of a literalist interpretation of the Genesis creation narrative found in the Bible.  Hovind's views, which combine elements of creation science and conspiracy theory, are dismissed by the scientific community as fringe theory and pseudo-scholarship.  He has been criticized by Young Earth Creationist organizations like Answers in Genesis for his continued use of discredited arguments that have been abandoned by others in the movement.

Kevin Henke: Kevin R. Henke is an American geochemist and former instructor at the University of Kentucky's department of Geology.  He currently works as a senior research scientist at the University of Kentucky's Center for Applied Energy Research.  He is well known for his criticism of young earth creationism and the scientific arguments they make for a young earth.  In particular, he has been critical of the RATE project's results, which claim to show that zircons contain too much helium to be billions of years old, and has argued that Russell Humphreys, a young-earth creationist who was involved in the project, has made errors in his research.  These flaws include that, according to Henke, "The vast majority of Humphreys et al.'s critical a, b, and Q/Q0 values that are used in these "dating" equations are either missing, poorly defined, improperly measured or inaccurate."  Henke has also accused Humphreys of misidentifying his specimens, fudging his data, and not considering the possibility of helium contamination in this research.  He has also criticized John Woodmorappe for arguing that radiometric dating is unreliable.  On one occasion, Henke called Kent Hovind on the phone regarding Hovind's $250,000 challenge to "prove" evolution.  Hovind told Henke that in order to win the money he would have to recreate the Big Bang in a laboratory.  Henke responded by proposing several alternative "proofs" that pertained to geology (his field of expertise), but Hovind refused, saying that the project must be chosen by him and it must not pertain to the area in which Henke has scientific expertise.  Hovind therefore required Henke to prove that dogs and bananas had a common ancestor, and lowered the award to only $2,000 should he succeed.  Henke accepted the challenge, and later drafted a contract, which was then posted on Talk.origins.  However, one of Henke's requirements was that the judges be unbiased, and Hovind rejected the challenge for this reason, insisting that he should be the only one who can choose the judges.

We the People Foundation: We the People Foundation for Constitutional Education, Inc. also known as We the People Foundation is a non-profit education and research organization in Queensbury, New York with the declared mission "to protect and defend individual Rights as guaranteed by the Constitutions of the United States."  It was founded by Robert L. Schulz.  At the U.S. Department of Justice, he is known as a "high-profile tax protester".  The Southern Poverty Law Center asserts that Schulz is the head of the leading organization in the tax protester movement.  The organization formally served a petition for redress of grievances regarding income tax upon the United States government in November 2002.  In July 2004, it filed a lawsuit in an unsuccessful attempt to force the government to address the petition (see below).  The organization has also served petitions relating to other issues since then.

Tax protester history in the United States: A tax protester, in the United States, is a person who denies that he or she owes a tax based on the belief that the Constitution, statutes, or regulations do not empower the government to impose, assess or collect the tax.  The tax protester may have no dispute with how the government spends its revenue.  This differentiates a tax protester from a tax resister, who seeks to avoid paying a tax because the tax is being used for purposes with which the resister takes issue.

Tax protester: A tax protester is someone who refuses to pay a tax claiming that the tax laws are unconstitutional or otherwise invalid.  Tax protesters are different from tax resisters, who refuse to pay taxes as a protest against the government or its policies, not out of a belief that the tax law itself is invalid.  The United States has a large and organized culture of people who espouse such theories.  Tax protesters also exist in other countries.

Tax protester Sixteenth Amendment arguments: Tax protester Sixteenth Amendment arguments are assertions that the imposition of the U.S. federal income tax is illegal because the Sixteenth Amendment to the United States Constitution, which reads "The Congress shall have power to lay and collect taxes on incomes, from whatever source derived, without apportionment among the several States, and without regard to any census or enumeration", was never properly ratified, or that the amendment provides no power to tax income.  Proper ratification of the Sixteenth Amendment is disputed by tax protesters who argue that the quoted text of the Amendment differed from the text proposed by Congress, or that Ohio was not a State during ratification.  Sixteenth Amendment ratification arguments have been rejected in every court case where they have been raised and have been identified as legally frivolous.

Cheek v. United States: Cheek v. United States, 498 U.S. 192 (1991) , was a United States Supreme Court case in which the Court reversed the conviction of John L. Cheek, a tax protester, for willful failure to file tax returns and tax evasion.  The Court held that an actual good-faith belief that one is not violating the tax law, based on a misunderstanding caused by the complexity of the tax law, negates willfulness, even if that belief is irrational or unreasonable.  The Court also ruled that an actual belief that the tax law is invalid or unconstitutional is not a good faith belief based on a misunderstanding caused by the complexity of the tax law, and is not a defense.

Irwin Schiff: Irwin Allen Schiff (February 23, 1928 – October 16, 2015) was an American tax protester known for writing and promoting literature in which he claimed the income tax in the United States is illegal and unconstitutional.  Judges in several civil and criminal cases ruled in favor of the federal government and against Schiff.  As a result of these judicial rulings, Schiff was serving a sentence of at least 13 years for tax crimes at the time of his death.  The Federal Bureau of Prisons reported that Schiff died on October 16, 2015.  Schiff was the father of businessman and former United States Senate candidate Peter Schiff.

Tax protester arguments: Tax protester arguments are arguments made by people, primarily in the United States, who contend that tax laws are unconstitutional or otherwise invalid.

Eddie Ray Kahn: Eddie Ray Kahn is an American tax protester.  Kahn is currently in prison for tax crimes, with a tentative release date of 2026.  Kahn founded the group American Rights Litigators and ran the for-profit businesses "Guiding Light of God Ministries" and "Eddie Kahn and Associates."  According to the U.S. Justice Department, all three organizations are or were illegal tax evasion operations.

Supporting paragraphs: Kevin Henke Kent Hovind
Answer: Kent Hovind