In general every business has to comply with sanctions and embargoes, but the law does not prescribe how they have to enact their compliance rules. Specific bus

In general every business has to comply with sanctions and embargoes, but the law does not prescribe how they have to enact their compliance rules. Specific businesses (financial institutions, weapons manufacturers, uranium refiners, etc.) must have protocols to screen their clients, with requirements that vary by industry. Disclaimer: IANAL, things vary by jurisdiction, and I am not from the US.