1. Huntington v. Attrill (1892) – Penal vs Civil Test

Case: Huntington v. Attrill, 146 U.S. 657 (1892)

Rule Established:

The Supreme Court held that:

• A foreign judgment is not enforceable if it is penal in nature
• A law is “penal” if it punishes an offense against the public (not just compensates an individual)

Importance for Digital Penalties:

Most overseas digital fines (GDPR-type fines, data protection penalties) are treated as:

• Public law enforcement actions
• Not private compensation claims

➡️ Therefore, under this case, such fines are generally not enforceable in the US.

2. Wisconsin v. Pelican Insurance Co. (1888)

Case: Wisconsin v. Pelican Insurance Co., 127 U.S. 265 (1888)

Rule Established:

• US courts will not enforce:
  • Foreign penalties
  • Foreign public laws
  • Foreign revenue claims

Key Principle:

“The courts of no country execute the penal laws of another.”

Application:

A foreign digital regulator imposing a fine (e.g., for data misuse) is exercising sovereign penal authority, which US courts refuse to enforce.

3. Hilton v. Guyot (1895) – Comity Doctrine

Case: Hilton v. Guyot, 159 U.S. 113 (1895)

Rule Established:

• Foreign judgments may be recognized under international comity
• But only if:
  • The foreign system provides fair due process
  • The judgment is civil and not penal

Relevance to Digital Penalties:

Even if a foreign tech regulator imposes a large fine, US courts will check:

• Was due process followed?
• Is it civil compensation or punishment?
• Does enforcement violate US public policy?

➡️ Most digital regulatory fines fail the “civil” requirement.

4. Banco Nacional de Cuba v. Sabbatino (1964)

Case: Banco Nacional de Cuba v. Sabbatino, 376 U.S. 398 (1964)

Rule Established:

• US courts avoid reviewing certain foreign sovereign acts under the act of state doctrine

Relevance:

• Digital penalties imposed by foreign governments may be seen as sovereign acts
• However, enforcement is still different from recognition

➡️ Even if respected as sovereign acts, they are not automatically enforceable judgments in US courts.

5. Bridgeway Corp. v. Citibank (2000)

Case: Bridgeway Corp. v. Citibank, 45 F. Supp. 2d 276 (S.D.N.Y. 1999), aff’d 201 F.3d 134 (2d Cir. 2000)

Rule Established:

US courts may refuse to enforce foreign judgments if:

• The foreign judicial system lacks stability or fairness
• Due process standards are questionable

Relevance to Digital Penalties:

Even if a digital penalty is technically “civil,” US courts may refuse enforcement if:

• The issuing country lacks reliable judicial safeguards
• Regulatory enforcement appears arbitrary or political

6. Ackermann v. Levine (1986)

Case: Ackermann v. Levine, 788 F.2d 830 (2d Cir. 1986)

Rule Established:

• Foreign judgments are generally enforceable if:
  • Final
  • Conclusive
  • From a fair system
  • Not contrary to US public policy

Relevance:

Digital penalties may fail enforcement if they are:

• Excessive (punitive fines disproportionate to harm)
• Regulatory punishments rather than compensation

7. Additional Supporting Principle: Public Law Exception

US courts consistently apply the “public law exception”, meaning:

• Foreign tax laws
• Foreign criminal fines
• Foreign regulatory penalties

are generally not enforceable.

This directly affects:

• GDPR fines (EU data protection penalties)
• Foreign cybercrime administrative fines
• Digital platform regulatory sanctions

How US Courts Treat Overseas Digital Penalties

1. Step 1: Classification

Courts first determine:

• Is it civil compensation → possibly enforceable
• Is it penal/regulatory punishment → not enforceable

2. Step 2: Public Policy Test

Even if civil, enforcement is denied if:

• It violates US constitutional principles
• It is excessively punitive
• It lacks due process

3. Step 3: Recognition Statutes

Most states follow:

• Uniform Foreign-Country Money Judgments Recognition Act (1962/2005 versions)

But these statutes exclude penal, tax, and fines.

Conclusion

In the United States, overseas digital penalties are rarely enforceable because:

• They are usually considered penal or regulatory
• US law refuses to enforce foreign sovereign punishment
• Courts prioritize civil nature + due process + public policy compliance

Key Takeaway:

A foreign “digital fine” may be valid in its own country, but in the US it is generally treated as a non-enforceable penal judgment, not a collectible debt.