Yellow Cab Company
During the 1910s and 1920s the company was involved in considerable illegal activity relating to mobsters and in particular to the Chicago Outfit. Yellow Cab was involved in a bitter rivalry with Checker Taxi at the time which led to a number of shootings, deaths and firebombings.
By 1925 the company was a subsidiary of the 'Chicago Yellow Cab Company', a public holding company with shares equally divided amongst Hertz, Parmelee and a small group of other investors. Hertz sold the Yellow Cab Manufacturing Company to General Motors in 1925. He sold his remaining interest in the Yellow Cab Company in 1929. Yellow Cab Co. (of Chicago) was bought by Morris Markin, who had established Checker Cab Manufacturing Company, with the Checker Taxi, a driver's cooperative.
In 1929 he sold his remaining share of Yellow Cab to concentrate on car rental (later Hertz Rent-a-Car which incidentally still uses a yellow logo). The sale was prompted by the violence associated with the business that culminated in 1928 in his racing stables being destroyed in a $200,000 fire in which 11 thoroughbred horses were burned.
Yellow Cab Co. was sold again in 1996 to Patton Corrigan, who in turn sold controlling interest in 2005 to Michael Levine, a third-generation taxicab operator from New York City. The Levine/Corrigan group has also purchased the Checker Taxi Affiliation in Chicago, to reunite the two companies once again. In 2015, Yellow Cab of Chicago filed for bankruptcy. Yellow Cab Co eventually split into multiple companies across the nation bearing the Yellow Cab name In January 2016, San Francisco's Yellow Cab filed for bankruptcy protection. 
- "Yellow Taxicab...".
- "Yellow Cab Co. (of Chicago)".
- "Yellow Cab bankruptcy means couple may not see 'a dime' of $26M verdict". chicagotribune.com. Retrieved 2015-05-27.
- "San Francisco's Biggest Taxi Operator Seeks Bankruptcy Protection". Wall Street Journal. Retrieved 2016-01-24.