The field was lackluster and riven by scandal (hello, Carlos Danger).
But on the French left — riven by ideological splits from competing centuries — that job is akin to herding cats.
It was riven with rivalries, some of her people were deeply disloyal, and the dirty laundry was aired in public.
"tear in pieces, strike asunder," c.1200, from a Scandinavian source akin to Old Norse rifa "to tear apart" (cf. Swedish rifva, Danish rive "scratch, tear"), from PIE root *rei- "to scratch, tear, cut" (see riparian).