You would think we would be swimming in discussions of the history of, say, the New York City medallion system. But the only thing I can find are links to a book that I may have to read, Graham Hodges’ Taxi! A social history of the New York City cab driver, and vague references to the Great Depression and strike violence.
"The competition 'was merciless,' according to Hodges, and 'Many cabbies turned to petty crime to help make ends meet.'
"There were strikes, and there were fare wars.
"Ultimately, an alderman named Lew Haas decided to do something about it.
"In 1937, he proposed a bill that would limit the number of taxis to 13,595, and make medallions automatically renewable, tradeable assets. It was signed that year by Mayor Fiorello LaGuardia."[1]
"A 1934 strike turned violent, despite various promises of taxi drivers' associations to Mayor Fiorello LaGuardia that peace would prevail."[2]
"Until 1935, the taxi industry in New York was comprised of unregulated companies fighting for dominance. This all changed during the Great Depression. Widespread poverty prompted many New Yorkers to opt for less-expensive forms of transportation, decreasing the demand for taxis. This put many companies out of business and caused many cabdrivers to lose their jobs. The situation was made worse by the tactics of 'wildcat' (unlicensed) taxis who used what some considered to be 'underhanded tactics,' such as drastically lowering fares, to get more business."[3]