A judge on Wednesday issued a preliminary injunction to block enforcement of South Dakota’s new “riot-boosting” law, which passed earlier this year to deter pipeline protests. The law threatens heavy penalties for any person or group that encourages a “riot,” which is defined broadly enough to include many forms of public protest. US District Judge Lawrence Piersol granted the injunction in response to a motion filed by the ACLU, which is representing four organizations and two Indigenous individuals in a suit alleging that the law is unconstitutional for its troubling vagueness and “chilling effect” on free speech.