“…Although the term itself was coined by Reiss (1980) only 30 years ago, many of the early, 20 th century crime scholars have considered co-offending to one extent or another (e.g., Cloward and Ohlin, 1960;Cohen, 1955;Shaw and McKay, 1942;Shaw and Moore, 1931;Sutherland, 1947). Some studies point to opportunist co-offending patterns (Lantz and Hutchison, 2015;McGloin et al, 2008;Warr, 1996; see also Nagin, Lum, and Solow, 2015), while others have found that crime committed in groups is in fact more profound than solo careerists (McGloin and Piquero, 2010;Felson, 2009). Co-offending groups can vary in size, ranging from three members (Reiss, 1988;Walsh, 1986) to many dozens-as in the case of gangs, "crime-by-association," and organized crime (Klein and Crawford, 1967;Weerman, 2003).…”