This is a list of the "Law & Order" and "Chicago" franchises, which frequently crossover with each other, as well as other TV shows and movies they crossover with, or at least share the same universe.
The X-Files, MillenniuM, The Lone Gunmen
Original from https://web.archive.org/web/20160324160205/http://filmreviews.gemeinschaftsforum.com/akte-x-die-einsamen-schuetzen-millennium-der-reihe-nach/
Law & Order: Chicago - Extended Universe
by John SheldonVIP EP 3