These publications give a comprehensive overview of the problem of corporate personhood. A few have condensations attached for your convenience.
Clements, Jeffrey D. (2014). Corporations are Not People: Reclaiming Democracy from Big Money and Global Corporations. San Francisco: Berrett-Koehler.
Hacker, J. S., & Pierson, P. (2010). Winner-take-all politics: How Washington made the rich richer–and turned its back on the middle class. New York:Simon & Schuster. Read a condensation of this book by James Allison.
Hartmann, Thom (2010). Unequal protection: How corporations became “people” and how you can fight back. San Francisco: Berrett-Koehler (2nd ed.).
Korten, David C. (2001). When Corporations Rule the World. San Francisco: Berrett-Koehler.
Mayer, Jane (2016). Dark Money: The Hidden History of the Billionaires Behind the Rise of the Radical Right. Knopf Doubleday Publishing Group. Read this insightful review in the NYTimes.
Nace, Ted (2003). Gangs of America: The Rise of Corporate Power and the Disabling of Democracy. San Francisco: Berrett-Koehler. Read a condensation of the book by James Allison.
Blumenthal, Paul, and Ryan Grim. The Inside Story Of How Citizens United Has Changed Washington Lawmaking. Huffington Post. 26 Feb. 2016. A really excellent piece on how Citizens United has corrupted our national politicians.