"We've been trying to eliminate this f***ing Jew for a long time," the letters allegedly warned ahead of Braun-Pivet's book signing event in Bordeaux.
Tensions between Israel and France escalate after visas for 27 French MPs are revoked. Jerusalem warns of a diplomatic clash in June.
French politicians decried the incident, calling it antisemitic, and said that it must stop.
A man wearing a Star of David pendant necklace was allegedly attacked by two men on Friday, with one man filing and another striking the victim on the head while calling him a "dirty Jew."
The attacker was a minor, according to a social media statement by French Interior Minister Bruno Retailleau.
Rabbi Arié Engelberg was on his way back from synagogue when he was reportedly kicked, punched, and bitten on the shoulder.
"This act of vandalism, just months after the attack’s tenth anniversary, is yet another reminder of the persistent threats Jewish communities face," the EJC said on X.
Marine Le Pen's transformation of the National Rally into a pro-Jewish party marks a significant shift, with French Jews now seeing it as an ally.
At Haifa Film Festival, Oscar-winning director discusses France’s antisemitism.
Rouen Mayor Nicolas Mayer-Rossignol condemned the antisemitic vandalism on Tuesday, saying on Facebook that such action had no place in the city or republic.