Since June, Dentons’ Mexican affiliate has been embroiled in a bitter “business divorce” dispute between the predecessor firm’s co-founders over allegedly stolen client information and false marketing. The suit, filed in Mexico City, has not started well for Dentons: The firm’s Mexico City office head was slapped with a court sanction earlier this month. And the dispute may get uglier.

The plaintiff, Gerardo Soria, a former name partner of Dentons predecessor firm López Velarde, Heftye y Soria (LVHS), is hoping to get a judge to void Dentons’ deal with his former partner and co-founder, Rogelio López-Velarde, and pay him back at least $1 million in capital he claims to be owed.