Generate a correct and concise answer for the question based on the words in the context.

Context : On April 25, 2005, Frank Calabrese, Sr. and a large number of high-profile Chicago Outfit gangsters were charged with murder, racketeering, extortion, and running an illegal gambling business as part of the federal-government initiated ''Operation Family Secrets'' investigation.
Question : Which crime led to the conviction of Frank Calabrese, Sr.?
murder