Learn Turkish: Bu kişi, işçileri temsil etmek adına burada. - This person is here in order to represent the workers.

Both can mean "in order to," but adına sounds more formal or official. While için is the everyday word for "in order to," using the infinitive + adına (temsil etmek adına) emphasizes a formal purpose, duty, or acting on someone's behalf, which perfectly fits this context of representing workers.

Could we just say işçiler adına instead of işçileri temsil etmek adına?

Yes, you absolutely could. Bu kişi, işçiler adına burada means "This person is here on behalf of the workers" (Noun + adına). By choosing to use the infinitive verb temsil etmek (to represent) instead, the sentence shifts to emphasize the action or formal purpose of representing them.

Why is it işçileri with the accusative suffix rather than just işçiler?

The compound verb temsil etmek (to represent) takes a direct object. Because the person is representing a specific, known group of workers, we must use the definite accusative case. We take işçiler (workers) and add the accusative suffix -i to make it işçileri.

How does a word that means "name" become a postposition meaning "in order to"?

Adına literally translates to "to its/their name" (ad = name, -ı = possessive, -n- = buffer, -a = dative). In English, we do something very similar when we say "in the name of." Over time in Turkish, this expanded from meaning literally "in the name of [someone]" to functioning as a formal way to express "for the sake of" or "in order to."