By Johan Ahlander

STOCKHOLM (Reuters) -The anti-immigration Sweden Democrats apologised on Thursday for the party's past Nazi links and antisemitism, part of efforts to present a more moderate, mainstream image to voters ahead of a national election next year.

The Sweden Democrats were presenting the results of a specially commissioned study that found Nazi and antisemitic views to have been common at party functions and in its printed materials in the 1980s and 1990s.

"That there have been clear expressions of antisemitism and support for National Socialist ideas in my party's history I think is disgusting and reprehensible," Mattias Karlsson, a member of parliament often described as the party's chief ideologist, told a news conference.

"I would like to reiterate the party's apology, above all to Swedish citizens of Jewish descent who may have felt a strong sense of insecurity and fear for good reasons."

The commissioning of the study sought to acknowledge and break with a past that has long hindered its cooperation with Sweden's mainstream political parties. The Sweden Democrats hope to join a future coalition government after the 2026 election.

The party first entered parliament in 2010 and currently supports Sweden's governing right-wing coalition government but has no members in the cabinet.

Tony Gustafsson, the historian hired by the party to write the book, said the party had emerged in the 1980s out of neo-Nazi and white supremacist organizations and that it had continued to cooperate with them into the 1990s.

"The collaboration seems to have involved using these groups to help distribute election materials," Gustafsson said, adding there were strong indications that one such group, the "White Aryan Resistance", had served as security guards at party gatherings.

Gustafsson said there had been a clear connection to Nazism until 1995, the year that current party leader Jimmie Akesson joined the Sweden Democrats, but that the Sweden Democrats had begun distancing itself from such links thereafter.

(Reporting by Johan AhlanderEditing by Niklas Pollard and Gareth Jones)