@richpuchalsky quite the other way around actually. A vanguard of the class struggle precisely emerges in the course of class struggle. Sometimes it's a previously existing organization like the CNT-FAI in Spain. Sometimes it emerges spontaneously like Solidarity in Poland. However these groups are not self-declared vanguards. A group becomes a vanguard of the class struggle when they are followed by many and arise to a leading role. Vanguard parties are not vanguards of the class struggle because it is not a position that you can declare for yourself.