Parks’s friends, in contrast, spanned Montgomery’s social and economic hierarchies. She had what sociologists call “strong ties”—firsthand relationships—with dozens of groups throughout Montgomery that didn’t usually come into contact with one another. “This was absolutely key,” Branch said. “Rosa Parks transcended the social stratifications of the black community and Montgomery as a whole. She was friends with field hands and college professors.” And the power of those friendships became apparent as soon as Parks landed in jail.
