Now we know what it takes to drag the Legislature back to Albany for a special session: Not a clear threat to public safety — but a threat to members’ job safety.

NY1’s Zack Fink and others report that lawmakers are preparing for a “special” if, and apparently only if, the commission that’s rewriting state campaign law dares to end “fusion voting.”

New York is near unique in allowing minor parties to cross-endorse major-party candidates. Once a key factor in beating Tammany Hall, it now mainly lets minor parties collect rent from the big boys in exchange for further entrenching incumbents.

Not that the commission that might end the practice is any less of an offense to good government. It was created in a deal between Gov. Andrew Cuomo and the Legislature’s Democratic leaders as a way to ram through taxpayer funding of state political campaigns without individual lawmakers (or, God forbid, the public) getting a chance to gum up the works.

Meanwhile, they’re all ignoring the pleas from the state’s district attorneys to clean up the new “no bail” law before it takes effect Jan. 1. This will drastically change rules for pre-trial discovery, endangering witnesses and otherwise complicating prosecution.

And it will spring all but the most violent defenders before trial, without funding pretrial services needed to supervise them.

The case of the Chinatown killer is Exhibit A for what can happen when troubled lawbreakers go free pretrial without services to keep them on the straight and narrow.

But the Legislature’s leaders don’t care. Nor do they object to outrages from the “reform” commission — such as its unusual special Columbus Day meeting, a blatant bid to avoid public scrutiny.

Nope: The only thing that gets their attention is a threat to their own inside games.