Governments restrict dealings with specific countries, companies and people, usually for foreign-policy or security reasons (Russia, Iran, North Korea, terrorism, narcotics, human-rights abuse). Being listed is a government decision about a name, not a finding about a product.

• OFAC Sanctions List Search U.S. Treasury Searchable here
  The official search of the Specially Designated Nationals (SDN) list and other sanctions lists. Each entry names the program (for example Russia or Iran) behind it.
• OFAC sanctions programs U.S. Treasury
  Explains each sanctions program: who is targeted, under what authority, and what is prohibited.
• Consolidated Screening List U.S. Dept. of Commerce (Trade.gov)
  Combines OFAC lists, the Entity List and several State and Commerce lists in one search.
• Entity List U.S. Dept. of Commerce (BIS)
  Foreign companies restricted from receiving U.S. exports. The Federal Register notices behind each addition state the reason.
• EU sanctions map European Union
  Sanctions regimes across the EU, by country and by theme.
• UK sanctions list UK government
  The UK's consolidated list of sanctioned individuals, entities and ships.
• UN Security Council sanctions United Nations
  Sanctions regimes imposed by the Security Council, with the consolidated list.

Technology and services governments will not buy or allow because of the risk that a foreign state could use them for spying or disruption. The reason is a security judgment about the vendor, not a defect in the product.

• FCC Covered List Federal Communications Commission
  Communications equipment and services deemed national-security risks (for example Huawei, ZTE and Kaspersky). Each entry cites the determination behind it.
• ICTS rulings U.S. Dept. of Commerce (BIS)
  Published determinations on specific technology products and vendors, including the 2024 Kaspersky ruling and its reasoning.
• FASCSA orders U.S. federal acquisition
  Products and vendors federal agencies are barred from buying for supply-chain security reasons.
• Section 889 prohibitions U.S. federal acquisition
  The federal ban on certain Chinese telecom and video-surveillance vendors.
• Chinese military companies (1260H) U.S. Dept. of Defense
  The annual list of Chinese military-linked companies. Search the Defense Department's releases for "1260H".
• CISA Binding Operational Directive 17-01 CISA
  The 2017 order removing Kaspersky products from federal systems, with the stated rationale.

Products pulled or restricted because they injured people or could. These are recalls and safety actions, usually about a specific product, hazard and remedy, not about the company's country or politics.

• CPSC recalls Consumer Product Safety Commission Searchable here
  Consumer-product recalls with the hazard, the remedy and the number of units.
• SaferProducts.gov Consumer Product Safety Commission
  Public database of consumer reports of harm from products, a way to spot problems before a recall.
• FDA recalls and safety alerts Food and Drug Administration Searchable here
  Recalls of food, drugs, medical devices and cosmetics.
• FDA Enforcement Reports Food and Drug Administration Searchable here
  Searchable weekly recall records, with the reason for each recall and its class (I is most serious).
• NHTSA recalls National Highway Traffic Safety Administration
  Vehicle, tire, car-seat and equipment recalls, searchable by VIN or product.
• USDA food safety recalls USDA Food Safety and Inspection Service
  Recalls and public-health alerts for meat, poultry and egg products.
• Recalls.gov U.S. government
  One front door linking the federal recall agencies.

Warnings and restrictions issued by other countries' agencies. They often give the reasoning in plain language and show how views on a vendor differ between governments.

• Germany: BSI Federal Office for Information Security
  Germany's cybersecurity agency. Its 2022 warning against Kaspersky products is one example.
• UK: NCSC National Cyber Security Centre
  UK guidance and advisories on vendors and technology risk.
• EU: Safety Gate European Commission
  The EU rapid alert system for dangerous non-food products, searchable by product and risk.

Some U.S. states publish their own lists of technologies banned on government devices or networks. There is no single national list, so search each state's own site.

• Texas prohibited technologies Texas Dept. of Information Resources
  One example of a state list: apps, hardware and vendors banned on state devices, with the reason.