I want to know the answer to the following question:
What Mexican mayor tried to crack down on crime immensely?
All the background I'm provided with is that "Under policies enacted by Mayor Marcelo Ebrard between 2009 and 2011, Mexico City underwent a major security upgrade with violent and petty crime rates both falling significantly despite the rise in violent crime in other parts of the country.". Is that enough to answer the question?
Answer: yes