It's not hard to use national law and certain tax scheme's to motivate the sellout of private assets to goverment. Indeed share price typicly is in function of company profits which can be depressed trough tax.
In itself, nationalisation can be viable, in fact more "democratic" than privitization. What actually tends to matter is the effeciency of management of any public company.
It is actually also possible to "have nationalised sectors be managed by private company's" which is an interresting concept given general criticism against nationalisation. It begs to question: if the crux of the matter is competitive management why should ownership nessecarily be private? There would be plenty of motivation for the manager and the employee's of private firm utilizing goverment assets to do so effeciently if their fee was variable depending on such performance.
As a proponent of a gradual change to "direct deconomic democracy", i think what matters more are the rules that govern a goverment owned industry or sector. Otoh, in many representative democracy's party's seem interrested to retain the abilety to appoint rather than letting competition provide it's managers.