The U.S. Supreme Court case Irving Rust, et al. v. Sullivan, Louis W., Secretary of Health and Human Services (1990) revolved around the interpretation of a federal regulation that prohibited recipients of Title X family planning funds from engaging in abortion-related activities such as counseling or referrals for abortions. The petitioners were medical professionals who challenged this rule arguing it violated their First Amendment rights to free speech and patients' right to receive information about all available health options including abortion services under Fifth Amendment due process clause. However, the Supreme Court upheld the regulation by a 5-4 vote stating that Congress had not exceeded its spending power in imposing conditions on receipt of federal funding nor did it violate physicians’ First Amendment rights because they could discuss abortion outside the context of federally funded programs without any restrictions. Furthermore, according to majority opinion delivered by Chief Justice Rehnquist, while government cannot prohibit doctors from discussing all aspects related to patient's condition even if involves controversial topics like abortion but when public funds are involved then government has every right to ensure those funds are used only for purposes approved by Congress.

In the dissenting opinion for Irving Rust, et al. v. Sullivan, Louis W., Secretary of Health and Human Services (1990), Justice Blackmun argued that the majority's decision was a direct violation of First Amendment rights to free speech. He contended that by upholding regulations prohibiting federally funded family planning clinics from discussing abortion with their patients, the court essentially allowed government censorship in these facilities. Furthermore, he expressed concern over how this ruling could potentially impact low-income women who rely on these clinics for medical advice and services; they would be denied full information about all legal options available to them during pregnancy due to ideological reasons rather than medical ones. This restriction not only interferes with doctor-patient relationships but also undermines public health objectives by limiting access to safe and legal healthcare procedures.