In the first of a four-part series, Al Jazeera goes undercover inside the Israel Lobby in Britain. We expose a campaign to infiltrate and influence youth groups, including the National Union of Students, whose president faces a smear campaign coordinated by her own deputy and supported by the Israel Embassy.

In part two of The Lobby, our undercover reporter joins a delegation from the Israeli Embassy at last year’s Labour Party Conference. The programme reveals how accusations of anti-Semitism were made against key Labour Party members – and how a former official at the Israeli Embassy was upset when her background was revealed.

In part three of The Lobby, our undercover reporter travels to the Labour Party Conference, revealing how accusations of anti-Semitism by group within Labour targeted Israel critics and saw some investigated.