This was a very good extra on my 'I Love You Again' DVD, that was disc 4 of my 5-film 'TCM Spotlight: Myrna Loy and William Powell Collection', and part of the 'Crime Does Not Pay' series that I have quite enjoyed. In it, the police try to show that these seemingly-harmless slot machines that the mobs try to get legitimate business owners to own and install in their establishments are rigged and are the first step for these thugs, in cities, to bring crimes waves in. Rowland was one of the finer directors of these shorts, and eventually was able to make larger, better pictures (a personal favourite of mine is the first cinematic adaptation of Dr. Seuss' work, 'The 5,000 Fingers of Dr. T.'.
Very much worth a look if you enjoy crime films of the period!