新同盟
Party's breakthrough came in late 1999, when former Prime Minister of Lithuania (and Homeland Union member) Rolandas Paksas became party's leader. In 2000 municipal election the Liberal Union won 13.99 per cent of the votes (first place was won by the New Union (Social Liberals) with 16.68 per cent of the votes) and mayorships in three major cities, Vilnius, Kaunas and Klaipėda. In the parliamentary election of the same year, the party won 17.25 per cent of the votes and 34 seats in Seimas. By this, the Liberal Union was the largest single party in Seimas for four months in 2000 and 2001.