[1] In 1928 Van Hall went to work at the American investment firm Kean, Taylor & co.,[2] a temporary assignment where he hoped to gain experience with the financial system that he could use back home.[3] Whilst his brother Walraven had connections with the resistance and is regarded as the leading figure behind the plot, Gijs leveraged his knowledge of finance and his position from inside the bank to write out false government bonds,[2] that would ultimately raise a total of 83 million guilders in illegal loans to victims of the occupation and Dutch resistance fighters; equivalent to 450 million Euros as of 2021.Van Hall attracted controversy over his response to Vietnam War protests in 1961, where a crowd that shouted "Johnson murderer" was found in violation of insulting the leader of an allied state, an offense at the time.[4] The final straw in Van Hall's career as mayor was a construction workers strike in June 1966, where 1 protester died; officially from a heart attack, but it was widely believed that police violence was to blame.[citation needed] In 1967, after investigations from the national government into the civil unrest, the Ministry of the Interior gave Van Hall the ultimatum to either be fired from his position or resign voluntarily.