18 U.S.C. § 3402.

In all cases of conviction by a United States magistrate judge an appeal of right shall lie from the judgment of the magistrate judge to a judge of the district court of the district in which the offense was committed.
(June 25, 1948, ch. 645, 62 Stat. 831; Pub. L. 90–578, title III, § 302(b), Oct. 17, 1968, 82 Stat. 1116; Pub. L. 100–702, title IV, § 404(b)(2), Nov. 19, 1988, 102 Stat. 4651; Pub. L. 101–650, title III, § 321, Dec. 1, 1990, 104 Stat. 5117.)