Cameron Downing, who was an official in the SNP's London branch, was sentenced to six years in prison at the High Court in Edinburgh.
He was convicted of sexually assaulting six young adults and physically assaulting two women.
The 24-year-old targeted his victims at addresses in the Edinburgh, Glasgow and Falkirk areas between Hogmanay in 2016 and April 2021.
Downing was also found guilty of domestic abuse, which involved conduct spanning several months, where he threatened to falsely accuse a former partner of raping him.
He said he would tell the man's friends, family and employers before blackmailing the victim to be in a sexual relationship with him.
Downing, who identifies as non-binary, has been pictured at an SNP conference with Nicola Sturgeon, the former Scottish first minister, and took part in a Pride march alongside Karen Adam, the SNP MSP and convenor of Holyrood's equalities committee. There is no suggestion they were aware of his wrongdoing.
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