South Side

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    This is from John Mariani's ENCYCLOPEDIA OF AMERICAN FOOD & DRINK, pg.
306:

_Southside._  A cocktail made by shaking over crushed ice the juice of 1
lemon, 2 t. sugar syrup, and 2 oz. Jamaican rum.  A "Northside" substitutes
orange juice for the lemon juice.  The drink may have originated in Chicago,
possibly in the 1950s.

     Ah yes, the southside of Chicago.  In the baddest part of town.  If you
go down there you better just beware of a man named Leroy Brown.
     Mariani's wrong.
     From HOUSE BEAUTIFUL (unfortunately, the Food & Drink Bar series ended
in 1942, to be replaced by war articles), March 1940, pg. 105, col. 3:

     A great many years ago the South Side Sportsmen's Club at Islip, Long
Island, originated what has become a classic drink, spread all over the world
by club members, many of whom are as talented gourmets as they are shots and
fishermen.  It is the _South Side_.  Pour into a tall glass or a stone beer
mug, 1 jigger of Bellows Fine Club gin, the juice of a lime or half a lemon,
1/2 teaspoon of sugar and plenty of chopped mint.  Shake well, then add
seltzer or club soda, or, omitting this final step, serve it as a cocktail.