In Stack v. Boyle, 342 U. S. 1 (1951), the Court held that an order denying a motion to reduce bail could be reviewed before trial. Writing separately, Justice Jackson recognized that "an order fixing bail can be reviewed without halting the main trial-its issues are entirely independent of the issues to be tried-and unless it can be reviewed before sentence, it never can be reviewed at all." 342 U. S., at 12.