How did Joseph Valachi contribute to the eventual decline of the American Mafia? A. he was an undercover agent from the U.S. Department of Justice who infiltrated the Genovese family and leaked their secrets B. he was the first boss to be convicted and sentenced to life in prison, which weakened his family C. he was the first member of the mob to break the code of silence and reveal important information about how the families were organized to the government D. he led the New York State police to a meeting of crime bosses in Apalachin, after which the government could no longer deny the existence of the Mafia