USC 18 § 245. Federally protected activities
…(b) Whoever, whether or not acting under color of law, by force or threat of force willfully injures, intimidates or interferes with, or attempts to injure, intimidate or interfere with—
(1) any person because he is or has been, or in order to intimidate such person or any other person or any class of persons from—
…(E) traveling in or using any facility of interstate commerce, or using any vehicle, terminal, or facility of any common carrier by motor, rail, water, or air;
…shall be fined under this title, or imprisoned not more than one year, or both; and if bodily injury results from the acts committed in violation of this section or if such acts include the use, attempted use, or threatened use of a dangerous weapon, explosives, or fire shall be fined under this title, or imprisoned not more than ten years, or both; and if death results from the acts committed in violation of this section or if such acts include kidnapping or an attempt to kidnap, aggravated sexual abuse or an attempt to commit aggravated sexual abuse, or an attempt
to kill, shall be fined under this title or imprisoned for any term of years or for life, or both, or may be sentenced to death.
You can download and read the entire USC 18 – Title: Crimes and Criminal Procedure