The head of the busiest US maritime gateway said Chinese-made cranes pose a potential risk to national security‚ but a shortage of other countries that build the giant container-moving machines makes it challenging to address the vulnerability. “They’re collecting data‚ they’re looking at information‚” Gene Seroka‚ executive director of the Port of Los Angeles‚ said in an interview Thursday on Bloomberg Television’s Surveillance. “What they’re using that data for is the question.” Biden...