‘Chicago’ dramas do big business for NBC

NEW YORK (AP) — Producer Dick Wolf’s factory of Chicago dramas is becoming increasingly important for NBC.
The Nielsen company said both “Chicago PD” and “Chicago Fire” scored their highest ratings in nearly two years last week with crossover episodes where they shared casts. “Chicago Med” actually had the biggest audience of the triumvirate with 9.1 million viewers, although the other two were close behind.
All three shows were among the 11 most-w