http://www.nytimes.com/1991/02/08/nyregion/at-the-fast-turning-hub-of-the-heroin-trade.html


"In a drive through the South Bronx, Ms. Cruz and the man she lives with, Clarence Dubois, a 25-year-old former crack dealer, pointed out spots where heroin called "Blue Thunder," "God Father," and "Good Fella" were being sold. The police say some packets of "Good Fella" were also found to contain fentanyl. "

I thought I read it in a book for some reason but this is the one source I could find right now. This article is from 1991...heroin stamp artists tend to be quite topical.