During World War II, tens of thousands of Spanish Republicans who fled to France after their defeat in the Spanish Civil War (1936–1939) fought actively with the French Resistance (Maquis), forming a powerful guerrilla movement.
The problem with this claim is that Spanish refugees were disarmed by the French army in 1939, if any L. F. M-1938 had made it to France, it would be present on reports. Many submachine guns were captured from the Republicans and integrated to French army which has reports on its inventory, but even if presume that the L. F. M-1938 was not marked because it went to police units or storage due to arriving in very low numbers (it was produced in very low numbers too…) than these guns would fall right in German or Vichy gov. hands anyway in 1940.
Also, the argument doesnt disprove the possibility that Spanish refugees fleeing to USSR brought some of these guns with them.
After Franco’s victory, the surviving units were taken over by the Spanish Civil Guard (Guardia Civil) or used by local anti-Franco partisans. There are only a few unconfirmed theories that a small number of these PPs may have found their way to the French resistance, but the German army never used them.