TPLF (Tigray People's Liberation Front) better known as Woyyane in collaboration with EPLF (Eritrean People's Liberation Front) better known as Shabia controlled Ethiopia after having removed by force the military junta known as Derg in 1991. The two liberation movements formed two different countries, Ethiopia and Eritrea, with a de facto Tigray-Tigrigne cooperation.
If one, for all practical purposes, ignores the short transitional coalition government with OLF (Oromo Liberation Front) moment which only lasted less than a year, Wayyane-TPLF has ruled Ethiopia uninterrupted since 1991 (i.e. over 21 years) with an iron fist. The late dictator Meles Zenawi was so smart that he saw the difficulty and enormous challenge to control the rest of Ethiopia, which is left after Eritrea's separation from Ethiopia, by TPLF as party name or as liberation movement name. Thus the dictator developed as part of the systematic oppression a fictitious coalition called EPRDF (Ethiopian People Revolutionary Democratic Front) to deceive the world (foreign donors) that there is a real political coalition of four political organizations representing several ethnic groups in Ethiopia: Amhara, Tigray , Oromo and all ethnic groups in southern Ethiopia. But in reality, it is not a true coalition. It's just Woyyane-TPLF who has the real power where the security apparatus, the judiciary and the military are all 100% controlled by people from the Tigray ethnic group.
The Ethiopian people had never had and will never have the opportunity to choose freely their representatives to the so-called federal parliament so long as Woyyane-TPLF controls the country.