During May 1935, the Gestapo broke up and arrested members of the "Markwitz Circle", a group of former socialists in contact with Otto Strasser, who sought Hitler's downfall.[56] From the mid-1930s into the early 1940s—various groups made up of communists, idealists, working-class people, and far-right conservative opposition organisations covertly fought against Hitler's government, and several of them fomented plots that included Hitler's assassination. Nearly all of them, including: the Römer Group, Robby Group, Solf Circle, Schwarze Reichswehr, the Party of the Radical Middle Class, Jungdeutscher Orden, Schwarze Front and Stahlhelm were either discovered or infiltrated by the Gestapo.