From China Digital Space
蓝爸爸 (lán bà bà): blue father
Blue father refers to Father Smurf. Father Smurf is a symbol for communism generally and for Karl Marx specifically.
Father Smurf has been linked to Karl Marx because of his distinctive white beard and for his role in saving the smurfs from Gargamel who is a symbol for capitalism (he wants to turn the smurfs into gold). His red hat and red trousers (Father Smurf is the only smurf to wear red) are also said to be symbols of communism (see here [English]), and here [Chinese]).