What covert ops did former Mossad chief lead in Lebanon prior to 1982 invasion?

A well known method which Israeli reporters use to bypass the military censorship is to take the story to the foreign press, (at the price of losing exclusivity, but sometimes journalists just want to get the stuff out). In the New Yorker profile of former Mossad head Meir Dagan, this paragraph appears:

Far from everything is known about Dagan’s career. Two reporters for Yediot Ahronot, Yigal Sarna and Anat Tal-Shir, once investigated a story that, before Israel’s 1982 invasion of Lebanon, which was aimed at rooting out Yasir Arafat and the Palestinian Liberation Organization, Dagan led a secret unit across the border whose mission was to instigate terrorist events that would justify an incursion. Military censor killed the story, Sarna told me. Dagan acknowledges the censorship but denies the thrust of the story.

I posted this paragraph in Hebrew on my Facebook wall. Sarna commented:

Indeed, the censorship [on these stories] has been on for years. Horrifying things were done there, not just planned.