A Waltham man was arrested Thursday afternoon on allegations that he harassed Katie Miller, a conservative podcaster married to Stephen Miller, one of President Trump’s closest advisers, in a series of menacing, expletive-laced text and phone messages, according to US Attorney Leah B. Foley’s office and a social media post by Katie Miller.John Anthony Proia III, 41, pleaded not guilty to a single charge of cyberstalking at an initial appearance and arraignment hearing in federal court in Boston, court records show.Magistrate Judge Paul G. Levenson ordered Proia to surrender his crossbows, machetes, and passport, and to have no contact with...