JERUSALEM — An early sign of moderation and compromise among the delegates here this week for the 39th World Zionist Congress appeared to shatter late Wednesday amid revelations that supporters of Prime Minister Benjamin Netanyahu sought to install his son Yair in a key leadership role.

The drama is roiling the high-stakes gathering that is often described as the “parliament of the Jewish people,” taking place against the backdrop of heightened antisemitism around the world and war in the region.

Delegates from more than 40 nations have converged in Jerusalem, with the U.S. delegation the largest in the congress’ history: 155 delegates and about 100 alternates, representing 22 states and a wide age range (18-87), including 75 rabbis of various streams.

The congress, which opened Tuesday

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