General Motors streetcar conspiracy

General Motors (GM) and related companies were convicted of monopolizing the sale of buses and supplies to National City Lines (NCL) and subsidiaries, and are alleged to have conspired to own or control transit systems, in violation of Section 1 of the Sherman Antitrust Act. This suit created lingering suspicions that the defendants had in fact plotted to dismantle streetcar systems in many cities in the United States as an attempt to monopolize surface transportation.

Source: Wikipedia — General Motors streetcar conspiracy (CC BY-SA 4.0)