In 1922 he took part in the coup d'état of Elez Isufi that attacked Tirana to overthrow the government, but the rebels were defeated by Captain Prenk Pervizi and their soldiers who had come to the aid of Ahmet Zog, who was then Minister for the Interior.

At the time the possible candidates for this role in Albania were Muharrem Bajraktari, Prenk Pervizi, Hysni Dema, Fiqri Dine, Gjon Markagjoni, Myslym Peza and Mustafa Gjinishi (a communist).

In April 1941, a small group led by Abaz Kupi, Xhemal Herri, Gani Kryeziu and Mustafa Gjinishi, with the support of Muharrem Bajraktari, entered Albania from the Yugoslav frontier.

In 1943 Captain Xhemal Herri, chief of secret services for King Zog, was killed by Abaz Kupi in Kruja in unclear circumstances.

Soon after the conference, he was forced to leave the communists (National Liberation Front) and created the Legality Movement, which wanted to see the return of King Zog to Albania.

Apart from some sporadic fighting in September 1943 in Krujë (while he was still with the communists), Kupi's forces did not attack German troops, although pressed to do so by the British mission, which was working with them.

Meanwhile, the communists had taken over in Albania, pushing several important nationalists, Zogist and anti-communist leaders and supporters into exile, including Muharrem Bajraktari, Fiqri Dine, Prenk Pervizi, Zef Pali, Abaz Kupi, Abaz Ermenji and Salih Myftija (who was then followed by his son, Dr. Fuad Myftija, who went on to become Secretary General of the Legality Party in New York).