A string of deadly shootings connected to Oklahoma marijuana farms — including a quadruple execution and a home-invasion murder — has exposed a shadow network tied to New York money, organized crime and groups with links to China, according to a new report. Authorities told the New York Times that the operations were fueled by out-of-state cash, concealed ownership and lax marijuana laws — allowing criminal groups to scale up illicit grows, exploit immigrant labor and divert massive amounts of weed into the black market. The trail led investigators far from rural Oklahoma to New York City, where real estate...