Parts 1 and 2: https://electronicintifada.net/content/watch-film-israel-lobby-didnt-want-you-see/25876
Parts 3 and 4: https://electronicintifada.net/content/watch-final-episodes-al-jazeera-film-us-israel-lobby/25896
The documentary was part of a wider resarch journalism effort by Al Jazeera, the public TV of Qatar, which also included a documentary on the British Zionist Lobby and how it influences British politics, quite interesting to watch (I'll see if I can find the link later on). While the British part of the research was published without restrictions, the US part was censored by the Qatari government and never released by Al Jazeera.
However now the full documentary has been leaked and made available by the Electronic Intifada website. Thanks also to The Real News for making me aware of this important must-watch revelation.