In January 1937 he publicly denounced Jews living in Liechtenstein and sent numerous letters detailing them to officials in Nazi Germany.

As a result, Prime Minister of Liechtenstein Josef Hoop ordered the offices of the Vaterland to be searched for any letters to be confiscated and Vogelsang promptly left the country.

[1][2] The majority of the Landtag of Liechtenstein approved of Hoop's actions, but members of the Patriotic Union called for his resignation over the issue, believing the search to be unconstitutional.

[3] Notably fellow Patriotic Union members Otto Schaedler along with Alois Vogt in an act in protest against the government publicly rejected the allegations against von Vogelsang.

Eventually, in July 1937 it was concluded by both judges that Hoop had not acted unconstitutionally by ordering the search against Vogelsang and was subsequently legally acquitted of any wrongdoing.