What is Meyer Wolfsheim’s importance in this book?? specifically only from the beginning to ch. 4 The Great Gatsby by F. Scott Fitzgerald

In my opinion, the importance of Meyer Wolfsheim up to
this point in the book is mainly to show us something important about Gatsby.  What
Wolfsheim shows us is that Gatsby is really not the respectable businessman that he
seems to be.

When Nick meets Wolfsheim, it quickly becomes
apparent that Wolfsheim is a gangster.  For example, he really likes the place across
the street, even though he has a memory of an associate of his getting killed there by
(it is implied) rival gang members.  Gatsby later tells Nick that Wolfsheim fixed the
1919 World Series.

So this character shows us that Gatsby
is not what he seems and starts to hint at how Gatsby's American Dream has been gotten
through crooked means.