<h3>It would be proper... if it fits the sentence. </h3>
<em>(In your mentioned case it does)</em>
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It all depends on who you're referring to. Not a name, but whether it's <em>"they"</em> or <em>"them"</em> that would fit in the phrase.
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Example of <em>"whom"</em>:
"<em>Whom</em> did you call?"
If you rephrased the sentence, "them" would fit in there, hence why <em>"whom" </em>is used.
"Did you call <em>them</em>?"
This works because <em>"they" </em>did not call your friend, your friend called <em>"them"</em>
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This is generally the law ⇣
<em>Who - They </em>
<em>Whom - Them</em>
The main reason people say <em>"who"</em> so much is just society, but most of the time it's correct anyway.
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Good luck! :)
~pinetree