In the United States v. Keitel case of 1908, the Supreme Court ruled on a matter concerning immigration law and naturalization. The defendant, Mr. Keitel, was accused of assisting immigrants in falsely obtaining citizenship through fraudulent means such as providing false testimony during their naturalization proceedings. The court had to decide whether this constituted a crime under Section 5395 of the Revised Statutes which made it illegal to knowingly aid or abet any alien or foreigner in fraudulently securing naturalization or citizenship papers. The Supreme Court held that Mr. Keitel's actions did indeed fall within the purview of this statute and thus he could be prosecuted for his role in facilitating these fraudulent acts even though he himself was not directly applying for citizenship nor personally making false statements before a court. This decision underscored that aiding and abetting others in committing unlawful acts related to immigration is itself an offense punishable by law.

In the dissenting opinion for United States v. Keitel, Justice Harlan argued that the majority's decision to uphold a lower court ruling against Mr. Keitel was incorrect because it failed to consider his constitutional rights under the Fifth Amendment. He contended that Mr. Keitel had been compelled in a criminal case to be a witness against himself, which is expressly prohibited by this amendment. The defendant was forced into self-incrimination when he was required by law to keep and produce certain books and papers related to his business operations as evidence of alleged fraudulence in bankruptcy proceedings initiated by creditors who were also government officials acting on behalf of public interests rather than private ones only, thus making them part of 'the Government' within meaning of said amendment according its spirit and purpose as well as precedents interpreting it broadly enough for protecting individual liberties from governmental abuses or overreaches regardless whether they're federal or state actors involved therein; therefore such compulsion violated his aforementioned right thereto protected thereby accordingly.