Chris Bunch's The Gangster Conspiracy

After their old headquarters were demolished by a competing security firm, the Star Risk, Ltd. team moved into swanky new offices. Unfortunately, there haven’t been any customers to impress—until the Reverend Josiah Williams drops by.
 
He represents a group of oppressed union workers from the planet Aretegal, and he would like the team to put a stranglehold on all shipping in the area. He also offers them a check for one million credits, which doesn’t hurt.
 
But where Star Risk goes, trouble follows. And before long, the rogues of Star Risk are forced to ask; what good are a million credits if you aren’t alive to spend it?