[5] Also Franssen liquidated numerous organizations, including the RKSP (Roman Catholic State Party), St. Jozefsgezellenvereniging (St. Joseph's Society), Vrouwen van Nazareth (Women of Nazareth), the Nederlandse Verenigen van Huisvrouwen (Dutch Association of Housewives), Vrijzinnig Democratische Bond (Liberal Democratic Union), Christelijke Democratische Unie (Christian Democratic Union), and Nederlandse Militaire Bond (Dutch Military League).
After the war, Franssen was tried and convicted by a Dutch postwar "special court of justice" and imprisoned from 5 May 1945, until 29 May 1948, including one year in the prison at Scheveningen.
In December 1948 he was convicted in the Civil Court of Rotterdam (Strafprocess, or penal case, number #16439/1947) of enemy collaboration due to his role in liquidation of political parties, in particular the RKSP, and sentenced to three (3) years (the prosecution had asked for 4).
), the "...business [of selling artwork at the behest of the occupying authorities] was going so well that Van Marle sold a part of the stock to clients in Germany under a private agreement.
"[12][full citation needed] No evidence has been published showing that Franssen, de Lakenhal Museum, or Van Marle & Bignell paid either Göpel's private payment or the auction proceeds to the Larsen estate executors.
"Post-war statements indicate that Bachstitz and his wife held anti-Nazi sentiments and were dedicated to protecting Jews by offering them a place to hide and holding their goods in trust.
[16] After the war, Franssen came to the attention of American intelligence officers in the OSS due to his Verwalter activities and his guidance of the collection of the German company Van Marle and Bignell.