Rubuta ci gaba don wannan sakin layi - A cikin shekaru biyu masu zuwa dangantakar Iwan Katz da jam'iyyar duk da haka ta kara tabarbarewa. Babu shakka yadda ya yi magana a fili ya tunatar da Walter Ulbricht da sauran magoya bayan jam'iyyar na wannan zamani kamar yadda shugaban ya yi dalilin da ya sa aka cire Katz daga jam'iyyar a 1926. Ya fito fili ya soki watanni goma sha biyu na Soviet na Berlin.
da aka kaddamar a watan Yunin 1948, ya raba ra'ayinsa da karfi tare da 'yan uwansa wakilai a wani taron jam'iyyar yanki a Zehlendorf a karshen shekara, kuma ya yi amfani da damar da za a kaddamar da hare-hare a kan sabuwar "shirin shekaru biyu" na gwamnati. A wannan lokacin, sakamakon sabon binciken da ya samu na adawa, Katz ya kasance "a karkashin binciken jam'iyyar". A ranar 21 ga Disamba, 1948, mutumin da gwamnatin Hitler ta cire daga mukaminsa a watan Maris na shekarar 1933 an sake cire shi daga mukaminsa a karo na biyu, a wannan karon gwamnatin Ulbricht ce, sabon nau'in mulkin kama karya na jam'iyya daya. Masu sharhi ba su manta da abin ba'a ba. Kimanin makonni goma sha ɗaya bayan haka, a ranar 14 ga Maris, 1949, Iwan Katz ya yi murabus daga membobin jam'iyyarsa. Watanni biyu bayan haka, a ranar 12 ga Mayu 1949, ya sake shiga SPD.