WASHINGTON—Alphabet’s Google urged a judge hearing a U.S. antitrust case against it to reject the Justice Department’s request that it be sanctioned, saying it had not abused attorney-client privilege. The department had asked Judge Amit Mehta to sanction Google, saying the company’s “Communicate with Care” program was sometimes a “game” to shield communications that did not genuinely fall under attorney-client privilege. In a filing dated Thursday, Google said that “allegations of sanctionable misconduct are baseless” and a misreading of a small number of slides used to train employees. Google also said it was conferring with the government on which emails that are indicated as potentially falling under attorney-client privilege genuinely do. It said it had given the government some of the affected documents. “Plaintiffs come nowhere close to proving the bad-faith misconduct that is required to strip a party of its privilege protections,” Google said in its filing. The Justice …