Whether 18 U.S.C. § 3553(a)(6) requires federal judges to compare a defendant's sentence to the sentences of his codefendants, the sentences of defendants nationwide, or a combination of the two

QUESTION PRESENTED To avoid “unwarranted sentence disparities,” does 18 U.S.C. § 3553(a)(6) require federal judges to compare a defendant’s sentence to the sentences of his codefendants (as two circuits hold), the sentences of defendants nationwide (as three circuits hold), or a combination of the two (as six circuits hold)? prefix PARTIES,