In the combination of German and Worker

The national socialists combined the (German) nationalism of the right with the internationalism of the (socialist) left. 

The national socialists thus represented themselves as a unity movement that spoke for the solidarity of the nation. In that solidarity could be found the basis of identity for the individual Nazi party member. In the combination of German and Worker the middle European found a national identity and a feeling of solidarity that had not been there since the height of the imperial times decades prior. 

Membership in a people affords an identity that serves as the ground for an individual's dignity and sense of self-possession. The totalitarians play on those needs and proffer easy paths to a sense of solidarity and identity when the liberals ignore those needs and even denigrate them.