California Gov. Gavin Newsom has been caught violating his own social-distancing rules by attending a birthday party at a Napa Valley restaurant with a dozen or so friends—even as some two million in his state are unemployed thanks to his strict virus rules.

The San Francisco Chronicle reported Friday that on Nov. 6 Mr. Newsom celebrated a political adviser’s 50th birthday with at least a dozen people from more than three households at the famous French Laundry restaurant (typical dinner: $350 excluding wine).