wijnkoop interpellated notably starting in 1918, with the government's action against german crown prince wilhelm, and the action of the mayor of amsterdam in connection with the movements that took place and the situation in the netherlands in connection with germany. this continued in 1919, against minister of foreign affairs herman van karnebeek on the presence of the former german emperor wilhelm in the netherlands, the transit of german troops through limburg and the persecution of jews in poland and galicia. this continued later into the year, when he talked with van karnebeek about the negotiations of the dutch authorities with various german authorities. after a year of no notable action in 1920, in 1921, wijnkoop interpellated against van karnebeek again, this time to provide support to the starving workers and peasants in soviet russia. then, in 1922 and 1924, he showed further communist sympathies by pressuring minister of the dutch government simon de graaff of the persecution against communists in dutch east indies, and against minister gerardus jacobus van swaaij on the pay cut for railway staff, respectively.