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There are interesting reports on state.gov describing the difficulties the JDL caused with the Soviet Union, eg.:
https://history.state.gov/historicaldocuments/frus1969-76v13...
Note that at no point do they discuss banning the JDL or charging members with belonging to the JDL.
Ok maybe I'm wrong or there is some subtle legalese but the wikipedia page states that "it was described as a "right-wing terrorist group" by the Federal Bureau of Investigation (FBI) in 2001".