Using primary documentation, Cesar Chavez's actions to reduce illegal immigration are detailed, because illegal immigration undermined efforts to help migrant farmworkers gain better pay and better working conditions. Recently a buyer questioned the historical authenticity of the above; here is the link from Ruben Navarrette, Jr.'s Washington Post editorial March 2014 which in part states, "The indefensible: Chavez, his cronies and the union itself were essentially surrogates for the Immigration and Naturalization Service. More concerned with maintaining leverage than protecting human rights, Chavez and Co. would call the INS to demand that they come and arrest illegal immigrants who crossed the picket lines..." http://www.chron.com/opinion/outlook/article/Navarrette-Film-on-Cesar-Chavez-offers-an-5340810.php
Ruben Navarrette, Jr. has researched Cesar Chavez, Delores Huerta, and the UFW for over 25 years.
Most students (and teachers) do not know that Cesar Chavez was against open border immigration and he acted on behalf of citizen migrant workers, not illegal immigrants.
Every Cinco de Mayo when some Hispanic students threatened walkouts based on illegal immigrant rights, students were enlightened through documents of Cesar Chavez's agitation to control the borders, because only when illegal immigration was controlled would citizen migrant workers be able to unionize for better pay and working conditions.
An extension of this activity would be to compare the March 2014 biographical movie of Chavez with the primary documents; i.e. "Does the movie treat Chavez's life 'in the fullness of time' or does it cherry pick events and actions to promote a particular political ideology?"