In May 1940, Germany invaded the Netherlands, and the occupation government began to persecute Jews by the implementation of restrictive and discriminatory laws; mandatory registration and segregation soon followed. The Frank sisters were excelling in their studies and had many friends, but with the introduction of a decree that Jewish children could attend only Jewish schools, they were enrolled at the Jewish Lyceum. Anne became a friend of Jacqueline van Maarsen in the Lyceum. In April 1941, Otto Frank took action to prevent Pectacon from being confiscated as a Jewish-owned business. He transferred his shares in Pectacon to Johannes Kleiman and resigned as director. The company was liquidated and all assets transferred to Gies and Company, headed by Jan Gies. In December 1941, Frank followed a similar process to save Opekta.