To briefly summarize:San Francisco voters approved Proposition K in 1978 which put an end of the sale of taxi medallions.
San Francisco voters passed Proposition A in November 2007 giving the Board of Supervisors the option of transferring the powers of the Taxi Commission to the SFMTA. The Supervisors did so and the SFMTA took over the regulation of the taxi industry on March 1, 2009.
In January of 2009, Mayor Gavin Newsom, who had promised not to put medallions up for sale if Proposition A passed, came out with a plan to take all the taxis medallions away from the current medallion holders and sell them in order to cover San Francisco's $500 million dollar debt.
