In this Aug. 6, 2017, file photo, demonstrators against the Keystone XL pipeline march in Lincoln, Neb. Civil liberties advocates have sued the U.S government alleging law enforcement agencies are maneuvering to crack down on anticipated protests over the Keystone XL oil pipeline. Attorneys for the American Civil Liberties Union want the court to order the release of all records pertaining to cooperation between federal, state and local law enforcement and private security companies. The suit cites prior efforts to disband protesters opposed to a separate project, the Dakota Access Pipeline.