On one side is the girl, who is now a woman of 22 and says that for the better part of a decade, a group of local thugs forced her into prostitution, ensuring her submissiveness with a steady diet of beatings, threats and rapes. On the other side are the accused — four older black men — who deny the woman’s charges and contend that she herself was a kind of predator: a troubled teenager who crossed Crown Heights’s racial divide with an appetite for sex.