yet you couldn't even answer the question
The movie doesn't even tell you what batman is trying to catch the mafia doing or what criminal enterprise he's trying to bring down
its oh them mob, we have to arrest him, nevermind for what, because we never see the mob do anything other than talk about batman being a thorn in their side, but we are never shown what exactly it is batman is doing to cause them problems lol
The beginning of the movie, begins with some kinda of deal, we don't even know and it's never explained why crane is meeting these people, and for what
or why the mob would be hurt by batman stopping this deal
it's just another random event in this completely random movie
The Batman 89 introduces batman in the first scene in his normal routine, which in fact see a crime and understand why batman would take action.
then quickly begins into the plot of the movie when he ease drops on the commission at the party at wayne manor, and learns about the jack napiers plan to dispose of the evidence at Axis Chemicals after unwittingly being setup by his boss, which begins his conflict with the joker which the movie centers around the very same chemicals that created the joker he uses to poison the population