
The United States Constitution, specifically Article I, Sections 9 and 10, outlines certain limitations on congressional powers to protect personal liberties and maintain a balance of power between federal and state governments. While there are six areas of legislation that the Constitution prohibits Congress from influencing, four powers remain relevant today. These include the Writ of Habeas Corpus, Bills of Attainder and Ex Post Facto Laws, Export Taxes, and the Port Preference Clause.
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What You'll Learn

Congress cannot suspend the writ of habeas corpus
The United States Constitution, specifically Article I, Sections 9 and 10, outlines certain limitations on federal powers to protect personal liberties and maintain a balance of power between the federal and state governments. One of these limitations is that Congress cannot suspend the writ of habeas corpus, a legal right that allows individuals detained by the government to challenge the legality of their detention in court.
The writ of habeas corpus, which literally means "produce the body," grants prisoners the right to appear in a court of law to contest their imprisonment. This right is considered fundamental in safeguarding individual freedom and ensuring that the government does not arbitrarily deprive people of their liberty.
While the Constitution generally prohibits Congress from suspending the writ of habeas corpus, there is an exception provided in what is known as the Suspension Clause. This clause states that "The Privilege of the Writ of Habeas Corpus shall not be suspended, unless when in Cases of Rebellion or Invasion the public Safety may require it." In other words, in extraordinary circumstances of rebellion or invasion, Congress may suspend the writ if it is deemed necessary for public safety.
Throughout history, there have been instances where presidents have controversially suspended the writ of habeas corpus during wartime. For example, President Abraham Lincoln suspended the writ during the Civil War, and Franklin D. Roosevelt did so during World War II. More recently, George W. Bush attempted to suspend the writ after the 9/11 attacks, but this was overturned by the Supreme Court.
The power to suspend the writ of habeas corpus is a significant responsibility and is intended to be used only in exceptional circumstances to maintain public safety. It is important to note that even when the writ is suspended, prisoners may still have access to habeas relief and can challenge the legality of their detention.
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Congress cannot pass bills of attainder
The United States Constitution prohibits Congress from passing "bills of attainder". This is a law that determines guilt and imposes punishment on a specific individual or group without the benefit of a trial. The Constitution only permits the judiciary to determine whether someone is guilty or innocent, and the prohibition against bills of attainder reinforces the idea that the government cannot punish someone without due process.
A bill of attainder is defined by the Supreme Court as a "law that legislatively determines guilt and inflicts punishment upon an identifiable individual without provision of the protections of a judicial trial". It is considered a violation of the separation of powers, as it would allow Congress to usurp the power of the judicial branch. The prohibition against bills of attainder also protects citizens against potential abuses of government power.
The Supreme Court has identified three types of legislation that would fulfill the "punishment" prong of the test: the "historical test", where the burden has traditionally been found to be punitive; the "functional test", where the type and severity of burdens imposed are equivalent to punishment because they do not further non-punitive legislative purposes; and the "motivational test", where the legislative record shows a congressional intent to punish.
In practice, this means that Congress cannot pass laws that impose criminal punishment on specific individuals or groups for actions they have taken without a trial. For example, in 2009, the House of Representatives passed a resolution barring the community group ACORN from receiving federal funding, which was later struck down as an unconstitutional bill of attainder. In another instance, Congress proposed retroactive taxation of up to 90% of the value of bonuses paid to employees when their employer had received funds from the Troubled Asset Relief Program (TARP). This was seen as an attempt to punish a specific group without due process.
The prohibition against bills of attainder is outlined in Article I, Sections 9 and 10 of the U.S. Constitution, which specify limitations on federal powers to protect personal liberties and maintain a balance of power between the federal and state governments.
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Congress cannot enact ex post facto laws
The United States Constitution, in Article I, Section 9, prohibits Congress from enacting ex post facto laws. This means that Congress cannot create laws that retroactively criminalize actions committed in the past. The purpose of this prohibition is to protect citizens' rights by ensuring that individuals have fair warning of what actions are illegal before they engage in them.
Ex post facto laws are considered a violation of fundamental justice principles and are expressly banned in the Constitution. The Framers of the Constitution recognized the importance of preventing such laws from being enacted, as they can lead to unfair punishments and the destruction of lawful contracts. By including this prohibition in the Constitution, the Framers ensured that Congress could not invoke laws that would deprive citizens of their personal liberty without due process.
The prohibition on ex post facto laws applies to both the federal government and individual states. Article I, Section 9 of the Constitution addresses the federal government, while Article I, Section 10 targets state enactments. This dual prohibition highlights the significance of preventing ex post facto laws at all levels of government.
It's important to note that the interpretation and application of ex post facto laws have evolved over time. While the United States Constitution prohibits ex post facto laws in a criminal context, there are some instances where retroactive changes to civil laws have been upheld. For example, in Canada, convicted murderer Colin Thatcher was ordered to forfeit proceeds from a book he published after being paroled, despite the law being passed after his conviction.
The prohibition on ex post facto laws is a crucial aspect of the United States Constitution, protecting citizens from unjust laws and ensuring that their personal liberties are respected. By denying Congress the power to enact such laws, the Constitution maintains a balance between federal and state governments and safeguards the rights of the people.
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Congress cannot impose direct taxes
Article I, Section 9 of the United States Constitution prohibits Congress from exercising certain powers. One such restriction is that Congress cannot impose direct taxes. This limitation was in place until 1913 when the 16th Amendment was adopted.
The 16th Amendment granted Congress the power to levy taxes on incomes, regardless of the source, without apportionment among the states. Direct taxes, on the other hand, are taxes that must be paid directly to the government by individuals or businesses, such as income taxes. Before the 16th Amendment, direct taxes had to be apportioned among the states based on population.
The distinction between direct and indirect taxes is crucial in understanding the limitations on Congress's power to tax. Indirect taxes, such as excise taxes, are levied on the manufacture, sale, or consumption of certain goods and services. These taxes do not need to be apportioned among the states as long as they are uniform throughout the country.
The Supreme Court has played a significant role in interpreting and shaping Congress's power to tax. In the case of Pollock v. Farmers' Loan & Trust Co., the Court held that income taxes on rents, dividends, and interest were direct taxes and, therefore, had to be apportioned among the states based on population. However, in Brushaber v. Union Pacific Railroad Co. (1916), the Court upheld the federal income tax as an indirect tax, and Congress has continued to levy an income tax since then.
In summary, while Congress has the power to lay and collect taxes, its ability to impose direct taxes was restricted by the Constitution. The adoption of the 16th Amendment expanded Congress's taxation powers by allowing them to levy income taxes without apportionment among the states.
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Congress cannot regulate the slave trade
The US Constitution, specifically Article I, Sections 9 and 10, along with various amendments, outlines the powers denied to Congress. One of these limitations was the regulation of the slave trade, which was left to individual states rather than Congress.
At the Constitutional Convention in 1787, the issue of slavery sparked fierce debate. The southern-most states, including South Carolina and Georgia, threatened to refuse "to be parties to the union" if the regulation of the slave trade was not left to the states. The delegates agreed to a compromise: a 20-year ban on any restrictions on the Atlantic slave trade, in exchange for the southern delegates' cooperation. This agreement was formalised in the Slave Trade Clause, also known as Article 1, Section 9 of the Constitution, which stated that Congress could not prohibit the "importation" of slaves before 1808.
During the 20-year period between the adoption of the Constitution and 1808, popular support for the abolition of the slave trade and slavery itself grew, both domestically and internationally. In the 1790s, Congress passed statutes regulating the trade in slaves by US ships on the high seas, and the UK and other countries also passed legislation restricting the slave trade. In 1800, an act of Congress made it illegal for Americans to engage in the slave trade between nations, and authorised the seizure of slave ships and their cargo. Finally, in 1808, the "Act Prohibiting the Importation of Slaves" took effect, imposing heavy penalties on international traders.
However, the 1808 Act did not end slavery or the domestic sale of slaves within the US. A domestic or "coastwise" trade in slaves persisted between ports within the country, and the interstate sale of slaves remained legal. Although the Slave Trade Clause is no longer constitutionally relevant, the legacy of slavery and the persistent racial inequality it caused continue to impact law and society today.
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