Truck drivers for a hauling company, while loading a desk, found a $100 bill that had fallen out of the desk. They agreed to get it exchanged for small bills and divide the proceeds. En route to the...

Truck drivers for a hauling company, while loading a desk, found a $100 bill that had fallen out of the desk. They agreed to get it exchanged for small bills and divide the proceeds. En route to the bank, one of them changed his mind and refused to proceed with the scheme, whereupon the other pulled a knife and demanded the bill. A police officer intervened. What crimes have been committed?