What is the significance of Hellenists/Greeks in Acts 9:29?

And he spoke and disputed against the Hellenists [Ἑλληνιστάς]. But they were seeking to kill him.
(Acts 9:29, ESV)

This is in Jerusalem, and it is obviously that this verse points out Hellenistic (Greek speaking) Jews as opposed to Hebrew/Aramaic speaking Jews. Why is Paul’s conflict with the Hellenists and not the Hebrews? Paul is from the diaspora in Tarsus. Peter reaches the Gentiles in the next chapter. This seems too early for Paul to be an apostle to the Gentiles. But, it seems a likely cause for debate that Paul and the Hellenists might have more concern about the Gentiles than the Hebrew Jews. On Paul’s missionary journeys he does conflict with the synagogues of the Jewish proselytes turning to Christianity. Can we answer this question?

Note: the following doesn’t happen until chapter 13:

And Paul and Barnabas spoke out boldly, saying, “It was necessary that the word of God be spoken first to you [the Jews]. Since you thrust it aside and judge yourselves unworthy of eternal life, behold, we are turning to the Gentiles.
(Acts 13:46, ESV)