In Scales v. United States, the Supreme Court upheld a conviction under the Smith Act of 1940, which made it illegal to advocate for or be a member of a group advocating for the violent overthrow of the U.S. government. The defendant, Junius Irving Scales, was an active member and leader in the Communist Party USA (CPUSA). He argued that his First Amendment rights were violated by this law as he personally did not advocate violence nor did he have any intent to cause such action; rather he believed in achieving change through peaceful means. However, evidence showed that CPUSA had previously advocated for violent revolution and maintained doctrine supporting such methods during Scales' membership period even if they weren't actively promoting it at all times. The court ruled against him stating that "active" membership with knowledge of illegal objectives is enough to violate this act even without personal advocacy or intent from individual members - essentially ruling guilt by association permissible under certain circumstances when national security is threatened.

In the dissenting opinion for SCALES v. UNITED STATES, Justice Hugo Black argued that the majority's decision was a dangerous expansion of federal power that threatened individual liberties. He contended that it was unconstitutional to punish someone merely for being a member of an organization labeled as "subversive" by the government, without any evidence they personally advocated or intended to incite violent overthrow of the government. He believed this interpretation violated First Amendment rights and due process protections under Fifth Amendment because it criminalized mere association rather than specific illegal actions or intents. Furthermore, he expressed concern about potential misuse and abuse of such broad powers by authorities against unpopular groups or individuals in future scenarios beyond this case context involving Communist Party membership during Cold War era paranoia.