The first Big Brother alliance(s)
Big Brother's second season had a couple noteworthy firsts, including the show's first alliance, which was formed by Dr. Will Kirby, Shannon Dragoo, and Mike "Boogie" Malin, and dubbed "Chilltown."
All three members of the tight-knit trio were targeted by the other Houseguests, all of whom rallied together to form the show's second alliance, which was comprised of Bunky Miller, Kent Blackwelder, Nicole Schaffrich, Hardy Ames-Hill, Monica Bailey, and Autumn Day. This collective called themselves "TOP"—also known as "The Other People"—and their top priority was to break up Chilltown.
TOP managed to get Shannon and Mike "Boogie" evicted, but the crew eventually turned on each other and disbanded soon thereafter.
It was definitely nice while it lasted, though.
To see the loyalties form, watch Big Brother Season 2 on CBS All Access.