A timely release from Oxford University Press: (California State University, San Marcos). A description from the Press:
For much of the twentieth century, Immigration and Naturalization 
Service (INS) officials recognized that the US-Mexico border region was 
different.  Here, they confronted a set of political, social, and 
environmental obstacles that prevented them from replicating their 
achievements on Angel Island and Ellis Island, the most restrictive 
immigration stations in the nation.  In response to these challenges, 
local INS officials resorted to the law, nullifying, modifying, and 
creating the nation's immigration laws and policies for the borderlands.
In The INS on the Line,
 S. Deborah Kang traces the ways in which the INS on the US-Mexico 
border made and remade the nation's immigration laws over the course of 
the twentieth century. Through a nuanced examination of the agency's 
legal innovations in the Southwest, Kang demonstrates that the agency 
defined itself not only as a law enforcement unit but also as a 
lawmaking body.  In this role, the INS responded to the interests of 
local residents, businesses, politicians, and social organizations on 
both sides of the US-Mexico border as well as policymakers in 
Washington, DC.  Given the sheer variety of local and federal demands, 
local immigration officials constructed a complex approach to border 
control, an approach that closed the line in the name of nativism and 
national security, opened it for the benefit of transnational economic 
and social concerns, and redefined it as a vast legal jurisdiction for 
the policing of undocumented immigrants.
The composite approach 
to border control developed by the INS continues to inform the daily 
operations of the nation's immigration agencies, American immigration 
law and policy, and conceptions of the US-Mexico border today.
A few blurbs:
"Kang's deeply researched book yields powerful insights about the 
importance of studying immigration law in action, shifting our focus 
from Congressional policy-makers in the nation's capital to low-level 
immigration officials on the nation's southwestern border with Mexico in
 the first half of the twentieth century. Short on resources and torn 
between competing interests, immigration officers used their most 
powerful weapon--administrative discretion--to devise procedures that 
ultimately became national policy. Want to understand what made today's 
militarized border possible? Read this book!"--Lucy E. Salyer 
"The INS on the Line is a superb book. Kang 
provides an institutional history of the Immigration and Naturalization 
Service on the US-Mexico border that is engaging and deeply 
illuminating. She illustrates the myriad ways in which rank and file 
agency officials stationed in California, Arizona, and Texas not only 
implemented federal immigration law, but also helped craft the law 
itself, demonstrating that they did so not only to better reflect the 
complex realities of border life but also to better serve the agency's 
own interests. Though focused on the first half of the twentieth 
century, the book contains critical insights for our understanding of 
contemporary immigration policy. This timely book is a must-read for 
scholars interested in immigration policy, borderlands studies, and the 
American administrative state."--Cybelle Fox
More information is available 
here.