Lawsuits accused foreign oil companies of being complicit in violence against Nigerians . The Nigerian government has denied the allegations and said that its security forces are working to protect people from Boko Haram. The justices first heard the case in February 2012 , trying to sort out whether individuals alone -- or political groups and corporations also -- are covered by broad civil immunity for alleged international law abuses . Chief justice : Ruling for plaintiffs could affect Americans living , working or traveling overseas . NEW : Shell says ruling does n't weaken human rights but rights advocates disappointed .
Lawsuits accused foreign oil companies of being complicit in violence against Nigerians . The Nigerian government has denied the allegations and said that its security forces are working to protect people from Boko Haram. Chief justice : Ruling for plaintiffs could affect Americans living , working or traveling overseas . NEW : Shell says ruling does n't weaken human rights but rights advocates disappointed .