Is there a way to block individuals?

I'm looking to block specific individuals from multiple form submissions. They're requests have been denied multiple times but they continue to submit. Is there a way to block an individual on specific forms?

You can enable unique limits:

https://www.jotform.com/help/64-How-to-Set-Unique-Submissions-on-a-Form

https://www.jotform.com/help/223-How-to-set-Form-Limits-Based-on-a-Unique-Question

https://www.jotform.com/help/375-How-to-Have-Unique-Question-Using-Multiple-Fields