I've actually just been looking this up, and it turns out to be more complex than you'd imagine. In the late 19th century, some members of the early French socialist movement flirted with anti-semitic stereotypes for purposes of anti-capitalist propaganda. They may have helped prepare the soil in which overt political anti-semitism grew up and in which the Dreyfus affair was born (did you know, btw, that the French military didn't admit until the 1990s that Dreyfus was innocent?).
Now, some French socialists argued that Dreyfus was a class enemy and that his fate was no concern of theirs. This is what Jean Jaures, the leader of French socialism at the time, had to say, as he declared for the Dreyfusard position:
French socialists in Jaures time and after can certainly be accused of not opposing anti-semitism as strongly as they should have: but that wasn't onarchy's accusation. He accused French socialists of the postWW1 era of actively promoting anti-semitic images of a kind most often associated with the radical right. And this at a time when the leader of French socialism was himself Jewish.
So, I'm pretty sure that I'm right, that onarchy is a liar, and you are a fool.