The Sea Shepherd conservation group asked the US Supreme Court on Monday to lift an order forcing it to steer clear of Japan\'s whalers, who are seeking legal reprisals over harassment at sea. Since 2002, Sea Shepherd has annually disrupted Japan\'s contested hunt in the Southern Ocean but a US court issued an injunction on December 17 for the activists to stay at least 500 yards (meters) away from the whaling vessels. Environmental lawyer Robert F. Kennedy Jr., the son and namesake of the slain political icon, urged the United States to show support for the Sea Shepherd Conservation Society and its fugitive founder Paul Watson. \"It\'s a mission that only they are capable of accomplishing and that is absolutely vital to the enforcement of international agreements on the high seas which otherwise go unenforced,\" Kennedy told reporters. The International Whaling Commission has designated a whale sanctuary in the Southern Ocean. Japan kills whales in the area through a loophole in a 1986 moratorium on commercial whaling that allows lethal research. Kennedy called Japan\'s government-supported Institute of Cetacean Research, which runs the whaling program and sued Sea Shepherd, \"a pirate organization masquerading as a scientific research group.\" In a filing to the Supreme Court on Friday, Sea Shepherd and Watson said that the lower court \"acted rashly\" and voiced concern over the order\'s \"extraordinarily long reach\" to areas outside US jurisdiction. The document said that the injunction marked \"a potentially existential threat\" to Sea Shepherd as more than 80 percent of its funding comes from donations, which \"may slow to a trickle\" without the anti-whaling campaign. The US Court of Appeals for the Ninth Circuit cited safety concerns when it issued the injunction, effective until a decision on the case. The Institute of Cetacean Research hit back and was believed to have asked the judge to find Sea Shepherd in contempt of court -- which would potentially lead to punishment. Kennedy called Japan\'s government-supported Institute of Cetacean Research, which runs the whaling program and sued Sea Shepherd, \"a pirate organization masquerading as a scientific research group.\" In a filing to the Supreme Court on Friday, Sea Shepherd and Watson said that the lower court \"acted rashly\" and voiced concern over the order\'s \"extraordinarily long reach\" to areas outside US jurisdiction. The document said that the injunction marked \"a potentially existential threat\" to Sea Shepherd as more than 80 percent of its funding comes from donations, which \"may slow to a trickle\" without the anti-whaling campaign. The US Court of Appeals for the Ninth Circuit cited safety concerns when it issued the injunction, effective until a decision on the case. The Institute of Cetacean Research hit back and was believed to have asked the judge to find Sea Shepherd in contempt of court -- which would potentially lead to punishment.