NEWARK — For years Paul W. Bergrin eluded charges from his former colleagues in the United States attorney’s office that he had become “house counsel” for gangs, using his criminal defense practice here as an elaborate front for prostitution, drug running and even the killing of witnesses.

On Monday, a jury in Federal District Court convicted Mr. Bergrin of all 23 of the counts against him, including murder, after less than two full days’ deliberation. A previous trial ended in a hung jury.

Mr. Bergrin, a Bentley-driving, slick-haired lawyer who had earned renown defending drug lords, rap stars, and soldiers accused of abusing and killing Iraqis, had drawn crowds to the trial as he served as his own defense counsel, impassionedly arguing that he had done nothing more than any vigorous lawyer would do for his clients.

But as the jury read the drumbeat of “guilty,” he sat passively, then allowed himself to be led back to federal custody, where he has been since 2009. “It’s the first time I’ve known him to be speechless,” said Lawrence S. Lustberg, Mr. Bergrin’s standby counsel.