“[The Congress shall have the power] To declare war, grant letters of marque and reprisal, and make rules concerning captures on land and water ... ”
- Article 1, Section 8, Paragraph 11 of the United States Constitution
First of all, what's the legal difference between “piracy” and “privateering”?
In prior times, it was common for governments to grant official permission to raid the shipping of their nations' enemies, and allow them to be “privateers” in their nation's service. Things that would otherwise be considered “piracy” would be considered legal in this time if they had the official “letters of marque and reprisal” to allow them to do it. Privateering under a “letter of marque and reprisal” was protected by law, while things that were considered “piracy” were illegal even then.
East Indiaman Kent battling Confiance, a privateer vessel commanded by French corsair Robert Surcouf in October 1800
Why do I mention this? Because there's a part of the Constitution about granting “letters of marque and reprisal” to privateers – or rather, two parts about it – which might be worth going into here. I should first note that “letters of marque and reprisal” could sometimes be shortened to just “letters of marque.” In the Federalist Papers, Alexander Hamilton sometimes used the great Sir William Blackstone's “Commentaries on the Laws of England,” as a source for his arguments. (For the details of this, see this blog post about it.) I will thus try to use his same source, when I derive a good legal definition of “letters of marque and reprisal” for our purposes. In the “Commentaries,” Sir William Blackstone wrote that “the sufferer must first apply to the lord privy-seal, and he shall make out letters of request under the privy seal; and, if, after such request of satisfaction made, the party required do not within convenient time make due satisfaction or restitution to the party grieved, the lord chancellor shall make him out letters of marque under the great seal; and by virtue of these he may attack and seize the property of the aggressor nation, without hazard of being condemned as a robber or pirate.” (Source: Book 1, Chapter 7)
Sir William Blackstone







