How to Check a list of names?

So I have two lists of names. I need to find a way to remove, or mark so I can remove, the names that are in column one that are ALSO in column two.

So the first list is like:

karen
janet
francis
angus
elizabeth
daniel
brendan

and the second is:

karen
brendan
jonah
angus
elizabeth
bethany

So I would want to see in the end only the names that are original to the first list? So:

janet
francis

HOW CAN I DO THIS??

Thanks

Thanks, that was just the function I needed!