This really can't be the ultimate, definitive 'fact' as otherwise we really ought to label Liberal Democratic Party of Russia as 'liberal' (the name indicates it!), to describe The Conservative and Unionist Party as 'unionist' in the corresponding infobox, Social Democratic Party of Portugal as 'social democratic' etc. 
BTW, Labour's policies and electoral manifestos (which do not contain any notions of 'socialism' any more) are facts as well.