During the time when Nelson Mandela was imprisoned the Anti-Defamation League (ADL) was spying on American anti-Apartheid activists and sharing information with the South African government and their intelligence services.
In fact, in many areas, Israel's Apartheid gov't and the South African Apartheid gov't worked in collusion as partners.
In Sasha Polakow-Suransky's book 'The Unspoken Alliance: Israel’s Secret Relationship with Apartheid South Africa' it is written that then-ADL National Director Nathan Perlmutter co-authored an article calling Mandela's African National Congress “totalitarian, anti-humane, anti-democratic, anti-Israel and anti-American.”
Now, the ADL apparently loves Mandela and hopes that you will never learn about the historical realities I just briefly noted.
Don't fall for the revisionist history of the ADL.