It is true that Bob Ewell pestered Tom Robinson's widow, Helen, on more than one occasion. When her boss, Link Deas, noticed that Helen was coming from the wrong direction to work each day, he got to the bottom of the situation. Bob had been following her, making lewd remarks and threats. Link finally threatened to get Sheriff Tate involved, and Bob ceased his actions.
Whether Bob actually pestered the judge is another story. When Judge Taylor got up to investigate a noise outside his house, he saw the shadow of a man leaving in a hurry. More than likely it was Bob, but the judge didn't seem particularly rattled.