In Donovan et al. v. City of Dallas et al., the U.S Supreme Court addressed a case involving zoning laws in Dallas, Texas that were alleged to be racially discriminatory and unconstitutional. The plaintiffs, African American homeowners in an area zoned for single-family residences, challenged the city's refusal to grant them permits to build multifamily dwellings on their properties while such permits were granted to white property owners in similar zones. They claimed this constituted racial discrimination violating the Equal Protection Clause of the Fourteenth Amendment. The court ruled against Donovan and his co-plaintiffs stating that they failed to provide sufficient evidence proving racial discrimination by the city officials or showing any unequal treatment compared with similarly situated white property owners within these residential zones. Therefore, it was concluded that there was no violation of constitutional rights as per available evidence.

In the dissenting opinion for Donovan et al. v. City of Dallas et al., it was argued that the majority's decision to uphold a city ordinance regulating solicitation activities violated First Amendment rights, specifically freedom of speech and press. The dissenters contended that such regulation should not be allowed unless there is clear evidence showing that these activities pose a substantial threat to public safety or order, which they believed was not demonstrated in this case. They also expressed concern about the potential implications of allowing local governments to regulate constitutionally protected freedoms based on subjective determinations of what constitutes "annoyance" or "disturbance". Furthermore, they disagreed with the majority's view that door-to-door solicitation could be equated with trespassing, arguing instead that it is an essential method used by various groups - religious organizations, political campaigners etc., - for communication purposes and thus deserves constitutional protection.