Columbia subject headings:
Alcohol fuel industry--Brazil.
Brazil--Foreign relations--United States.
Employee rights--Brazil.
Forced labor--Brazil--Prevention.
United States--Foreign relations--Brazil.
Harvard subject headings:
Alcohol fuel industry--Brazil.
Brazil--Foreign relations--United States.
Employee rights--Brazil.
Forced labor--Brazil--Prevention.
United States--Foreign relations--Brazil.
Princeton subject headings:
Alcohol fuel industry--Brazil.
Brazil--Foreign relations--United States.
Employee rights--Brazil.
Forced labor--Brazil--Prevention.
United States--Foreign relations--Brazil.