it's not marxist definition, it's part of the practice. leftist action restrains the economic elite, it's against that hierarchy and gives more power, control, and considerations to people outside of that. fascism gets the reputation of being against the economic elite because the jews were framed as wealthy enemies, like they were the entire economic elite. what followed wasn't an anti-aristocrat conflict that ended with wealthy jews being executed, the economic elite was already ethnically german and they enjoyed pushing out jewish competition and being given more control and less competition by the government.
United States