It is unlawful to hang your laundry out to dry on a Sunday.

The Law Explained

Another casualty of strict Sabbath-day regulations, residents of Grand Forks were once forbidden from doing household chores on Sundays, and hanging laundry was the most visible offense. Local authorities believed that seeing underwear and bedsheets flapping in the breeze was disrespectful to churchgoers. You had to either wash on Saturday or let your clothes pile up.