あの男に

to that man

→ あの
phrase Rare #24,635
to that man に marks the person as a target or recipient; its natural translation can vary with the verb, such as “of that man” in “beware of that man.”
JA: あの男に手紙を渡しました。
EN: I gave that man a letter.

あの男には欠点があるので、私はいっそう彼が好きだ。

I like that man all the more because he has flaws.

あの男に話しかけている婦人は彼の先生です。

The woman talking to that man is his teacher.

あの男にどうしても話があるんだ

I absolutely need to talk to that guy.

— 自転車泥棒 (1948)

あの男には用心しなさい。

Be careful of that man.

あの男に知れたら皆殺しだ

If that guy finds out, he'll kill us all.

— パンズ・ラビリンス (2006)

あの男には気を付けるんだぞ。

Watch out for that man.

あの男には別だけど。

But that man is the exception.