A US governor has signed a bill requiring a French railway company to disclose its role in the Holocaust if it is to win state contracts.
Martin O'Malley of Maryland signed a bill aimed at Keolis, a Paris company owned by French national railways SNCF.
The company had bid to operate commuter trains in the state of Maryland.
Historians say SNCF moved 76,000 Jews to Nazi camps during the Holocaust. The laws' supporters say it will force disclosure of war records.