Ono, her son Sean Ono Lennon, and Julian Lennon - Lennon's son from his first marriage - had sought a preliminary injunction before the film gets a wider release.

BBC: Yoko Ono

The group includes Ono and Sean Lennon, the widow and son of musician John Lennon.

WSJ: APNewsBreak: Celeb fracking group not registered

In fact, the problem is getting so visible that even Yoko Ono and Sean Lennon formed an anti-fracking group ( Artists Against Fracking).

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