Recent analyses have suggested that working class voters in Europe are increasingly attracted by radical right parties. Nevertheless, some workers still vote for the left, including the radical left. In a context of increased economic uncertain and social inequalities, electoral volatility, party system fragmentation and polarization understanding vote choice for radical parties is intrinsically relevant. This paper focuses on lower-middle class and working class voters as a potentially propitious segment of the electorate for radical parties on the left and right, due to increasing discontent and grievances. We examine in detail which segments of the lower-middle and working classes are more likely to vote for radical left or radical right parties (and also as opposed to mainstream parties) as a function of their social structure positions, work conditions, social milieu and place of residence, while controlling for their political attitudes. We use a novel dataset collected purposely to comprehensively capture the labour market positions and conditions of voters in France, Germany, Greece and Spain in 2019.