It applies particularly to soldiers, police officers, corrections officers, collection bureau agents, bounty hunters, loss prevention, repossession agents, vigilantes, security guards (mainly those hired by private security companies), workers who cross and refuse to respect picket lines during a strike and anyone paid a wage who actively facilitates the status quo.
According to Barbara Ehrenreich: "Class treason is an option at all socioeconomic levels: from the blue-collar man who becomes a security guard employed to harass striking workers, to the heirs of capitalist fortunes who become donors to left-wing causes".
[1] In Russia before and during the Russian Revolution, the Bolsheviks and other socialist revolutionary organizations used it to describe the Czarist Army and any working class citizen who opposed the dictatorship of the proletariat.
While the idea of the class traitor is one typically applied to the proletariat, it can also be used to describe members of the upper-class who believe in and espouse socialist ideals.
[2][original research] Additionally, Friedrich Engels, partner and lifelong friend of Karl Marx, the revolutionary socialist, was himself a son of a wealthy factory owner.