In an effort to curb the spread of Spanish Flu in 1918, some states in the US quarantined citizens; others made the wearing of face masks mandatory, at the same time as shutting down “all places of amusement”. According to a law passed in San Francisco in October of that year, on the day that state-wide infections passed 50,000, anyone seen not wearing a gauze face covering was subject to fines that ranged from $5 to $100 and the possibility of 10 days’ imprisonment.