Operación llamada

Operación llamada
 

How can we say "operación llamada" in an immigration context?

perhaps operation phone call

no, Operación llamada is for example when people hear that if you migrate to a country you will be given food or money for food or any other benefits, then they spread the word and everybody wants to go to that country. The measure that you take that benefits so many people implies an operación llamada. and everybody want to go to that place.

its pull effect I just saw it on a news paper

Where immigration is concerned, there is no specific term that I can think of in English, but false rumor is a term used to cover such schemes.