The United States v. Spector case in 1951 revolved around the interpretation of a federal statute that made it illegal to conspire to injure or oppress any citizen in the free exercise and enjoyment of their constitutional rights. The defendant, Mr. Spector, was charged with conspiring to deprive certain individuals of their right to equal protection under the law by using his position as a public official (a Connecticut State Liquor Control Commissioner) for discriminatory practices against out-of-state liquor dealers. However, he argued that this charge was not valid because there were no specific allegations showing how he had violated these individuals' constitutional rights. The Supreme Court ruled in favor of Mr. Spector on grounds that the indictment did not sufficiently specify which constitutionally protected rights were infringed upon by his actions; thus failing to meet necessary legal standards for such charges. This decision emphasized the importance of specificity when charging someone with conspiracy against citizens’ constitutional rights - simply stating general terms like 'equal protection' without detailing exactly what aspect has been violated is insufficient.

In the dissenting opinion for United States v. Spector, Justice Frankfurter argued that the majority's decision was based on a misinterpretation of the law and an overreach of judicial power. He contended that Congress had not intended to exclude aliens who advocated peaceful change in property ownership from entering or remaining in the country, as interpreted by his peers. Instead, he believed it only sought to bar those advocating violent overthrow of government or destruction of property rights through forceful means. Furthermore, he criticized the Court’s role in interpreting Congressional intent without clear statutory language supporting their view and warned against such judicial activism which could lead to undermining democratic processes by substituting its judgment for legislative intent.