After the revolution was crushed, Sinkovits was banned from acting for a half year for his activities, and his membership in the National Theatre was terminated. Between 1958 and 1963, he worked in the Attila József Theatre. In 1963 he returned to the National Theatre and he became one of its dominant actors for decades. At 4 May 1991 reburial ceremony of Jozsef Cardinal Mindszenty in Esztergom, Sinkovits delivered a powerful rendition of Hungarian poet Mihály Vörösmarty's poem Szózat before the 50,000 mourners in attendance. Szózat is considered to be a second national anthem of Hungary.