Jim,
Neither Livingstone or Shah were guilty of Antisemitism

McDonnell says they both are.
Why would he lie?

Almost half of Labour's 229 MPs have signed an open letter warning that the decision not to expel Mr Livingstone over his comments is a "betrayal" of the party's values.
A total of 107 MPs, along with 48 Labour peers, put their name to the Jewish Labour Movement statement criticising the move to only hand Mr Livingstone an additional one-year suspension.

Shadow Foreign Secretary Emily Thornberry said in one TV interview(Andrew Marr)that the former London Mayor should be thrown out for offensive comments he made about Hitler and Zionism.