What about the hijackings back in the 70s, 80s? I don’t know if those count, but terrorism seems to be the left’s favorite cause. Lockerbie, Beirut, Israeli Olympic athletes, Berlin discotechs, Achille Lauro, Air India, then WTC Part 1 & 2. There’s lots of those, and more. They’ve been at this for decades. They’re pros.
The 70s hijackings were Palestinian socialists in cahoots with Nicaraguan Sandinistas...hence leftwing.