Swiss officials have seized two works by Claude Monet and a painting by Vincent van Gogh at the request of the United States government. The masterpieces are tied up in an investigation involving the Malaysian economic development fund, 1Malaysia Development Bhd. The U.S. government believes that the fund misappropriated $3.5 billion and used the money to acquire luxury real estate in New York, California, and London, and fine art, among other things.