に訴えて

appeal to

→ に
phrase Uncommon #16,737
appeal to Used with a person or group to mean appealing to them. In legal contexts, 訴える can mean sue; に訴えられる means be sued by someone, and 訴えてやる means I'll sue you.
JA: 彼は人々の良心に訴えて、寄付を呼びかけた。
EN: He appealed to people's conscience and called for donations.

私たちはその件について世論に訴えていなければならない

We must appeal to public opinion on the issue.

アメリカ裁判所に訴えてやる

I’ll sue you in an American court!

— きっと、うまくいく (2009)

パパに訴えてダメよ

Even if you appeal to Dad, it won't do any good.

— 大人は判ってくれない (1959)