When did Real Madrid win the biggest score in Barcelona history, and what was the score?

But please note: At that time, the Second World War was going on in Europe, and it was as close as a bee. At that time, fascist forces were very powerful in western Europe (except Britain). At that time, the ruler of Spain was Franco, who was very close to Hitler. He acted arbitrarily at home, and Real Madrid was built by him. So this score has a lot of political factors.