Someone stole Sam's credit card details and used the information to buy goods from the local grocery store. What is Sam a victim of?

Identity theft.

Step by Step Explanation:

Sam is a victim of identity theft. Identity theft is any case where someone is using your personal files or credit cards as if they were pretending to be you. Because whoever used his information to buy goods was buying them under Sam's name, but were not Sam, they have stolen his identity in the form of his credit card information.

Identity theft, whenever someone uses another's private identifying information, usually for financial gain, it is known as identity theft.