---
title: "Injunction — AP Gov Definition & Exam Guide"
description: "An injunction is a court order forcing someone to stop or perform an act. Learn how federal judges use injunctions to check the other branches in AP Gov Unit 2."
canonical: "https://fiveable.me/ap-gov/key-terms/injunction"
type: "key-term"
subject: "AP US Government"
unit: "Unit 2"
---

# Injunction — AP Gov Definition & Exam Guide

## Definition

An injunction is a court order, rooted in the judiciary's Article III equitable powers, that commands a party or government official to stop doing something (or to do something) to prevent irreparable harm. In AP Gov, it's a core tool courts use to halt executive or legislative action.

## What It Is

An injunction is a court order that tells someone what to do or, more often, what to STOP doing. Unlike a ruling that just awards money after harm is done, an injunction prevents the harm in the first place. [Courts](/ap-gov/key-terms/courts "fv-autolink") issue them when waiting for a full trial would cause "irreparable harm," meaning damage that can't be fixed later with cash. They come in temporary and preliminary forms (short-term freezes while a case plays out) and permanent forms (final orders after a decision).

For [AP Gov](/ap-gov "fv-autolink"), the injunction matters because it's how judicial power actually bites. A federal judge can enjoin (block) a presidential executive order or an agency policy nationwide, sometimes within days of it taking effect. That makes the injunction one of the judiciary's sharpest checks on the other branches, and because federal judges hold life tenure, they can issue these orders even when the policy they're freezing is popular. That independence is exactly what fuels the debate over judicial power in [Topic 2.10](/ap-gov/unit-2/court-action/study-guide/1gI0LsgGzM2XSs3is8lT "fv-autolink").

## Why It Matters

Injunctions live in **[Unit 2](/ap-gov/unit-2 "fv-autolink"): Interactions Among Branches of Government**, specifically **Topic 2.10 (The Court in Action)** and learning objective **AP Gov 2.10.A**, which asks you to explain how [life tenure](/ap-gov/key-terms/life-tenure "fv-autolink") leads to debate about the Court's power. Here's the link. Life tenure insulates judges from public opinion, so a single unelected district judge can issue an injunction freezing a major government policy nationwide. Supporters call that protecting constitutional rights from a runaway majority. Critics call it judicial overreach by people who never face voters. The injunction is the concrete mechanism behind that whole debate, so when an FRQ asks how courts check the executive or why judicial independence is controversial, this is the tool you point to.

## Connections

### [Life Tenure (Unit 2)](/ap-gov/key-terms/life-tenure)

Life tenure is what makes injunctions politically explosive. Because [federal judges](/ap-gov/key-terms/federal-judges "fv-autolink") can't be fired for unpopular decisions, they can enjoin a president's signature policy without worrying about reelection. That's judicial independence and the source of the 'too much power?' debate in 2.10.A, all in one order.

### [Brown v. Board of Education (Unit 3)](/ap-gov/key-terms/brown-v-board-of-education)

Declaring [segregation](/ap-gov/key-terms/segregation "fv-autolink") unconstitutional was only step one. Actually desegregating schools required follow-up court orders directing districts to act, which shows you why a ruling without enforcement teeth often needs injunctive relief to change anything on the ground.

### [Litigation (Unit 5)](/ap-gov/key-terms/litigation)

[Interest groups](/ap-gov/unit-5 "fv-autolink") that can't win in Congress often sue instead, and the prize they're usually after is an injunction. Asking a court to block a law or policy is faster and cheaper than flipping a legislative majority, which is why litigation is such a popular linkage-institution strategy.

### [Judicial precedent (Unit 2)](/ap-gov/key-terms/judicial-precedent)

When a judge decides whether to grant a preliminary injunction, they're predicting who will win based on precedent. Strong precedent on your side means the court is more likely to freeze the policy now rather than let possible harm pile up during the trial.

## On the AP Exam

No released FRQ has used "injunction" verbatim, but the concept sits underneath questions you will definitely see. Multiple-choice stems in Unit 2 test how the judiciary checks the executive and legislative branches, and an injunction is the textbook answer for HOW a court stops a policy before or while it's being litigated. On the Concept Application FRQ, a scenario about a judge blocking an executive order is asking you to explain judicial checks and the consequences of life tenure (AP Gov 2.10.A). On the Argument Essay, an injunction example is great evidence for either side of the judicial power debate, as proof the courts can protect rights or as proof unelected judges can override elected officials. Just be precise with the verb. Courts don't "veto" policies, they enjoin them.

## injunction vs Judicial review

Judicial review is the POWER to declare a law or executive action unconstitutional (established in Marbury v. Madison). An injunction is a specific court ORDER telling someone to stop or act. They often travel together, since a court that strikes down a policy will usually issue an injunction to stop its enforcement, but review is the judgment and the injunction is the enforcement tool. A court can also issue a preliminary injunction before it has fully ruled on constitutionality at all.

## Key Takeaways

- An injunction is a court order directing a party or government official to stop doing something (or to do something) in order to prevent irreparable harm.
- Injunctions come from the judiciary's equitable powers under Article III and can be temporary, preliminary, or permanent.
- Injunctions are one of the judiciary's strongest checks on the other branches because a single federal judge can freeze an executive or legislative policy, sometimes nationwide.
- Life tenure (AP Gov 2.10.A) lets judges issue unpopular injunctions without political consequences, which is exactly why the Court's power is debated.
- Judicial review is the power to declare something unconstitutional; the injunction is the order that actually stops the government from enforcing it.
- Interest groups use litigation to seek injunctions because blocking a policy in court can be faster than changing it through Congress.

## FAQs

### What is an injunction in AP Gov?

An injunction is a court order that commands a party or government official to stop a specific action (or perform one) to prevent irreparable harm. In AP Gov it appears in Topic 2.10 as a key way federal courts check the executive and legislative branches.

### Is an injunction the same thing as judicial review?

No. Judicial review is the power to declare a law or action unconstitutional, while an injunction is the specific order that stops enforcement. A court can even issue a preliminary injunction before fully deciding the constitutional question.

### Can one federal judge really block a president's policy?

Yes. A federal district judge can issue a preliminary injunction halting an executive order or agency policy, sometimes nationwide, while the case is litigated. Because judges hold life tenure, they can do this regardless of how popular the policy is, which is the core of the judicial power debate in 2.10.A.

### What's the difference between a temporary and a permanent injunction?

Temporary and preliminary injunctions freeze the situation while a case is still being decided, to prevent irreparable harm in the meantime. A permanent injunction is issued as part of the final judgment after the court rules.

### Do I need to memorize injunction cases for the AP Gov exam?

You don't need a list of injunction cases, but you should be able to explain the mechanism, meaning how a court order can halt government action and why life tenure makes that controversial. It's useful evidence for Concept Application and Argument Essay FRQs about checks and balances.

## Related Study Guides

- [2.10 The Court in Action](/ap-gov/unit-2/court-action/study-guide/1gI0LsgGzM2XSs3is8lT)

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