Not to be confused with Workers Defense League, a New York-based labor activist group with ties to the American socialist movement.
The Workers Defense Project is a left-of-center advocacy group that aids and provides representation for workers in the Texas construction industry, including illegal immigrants. It works alongside several prominent labor unions, with leaders from the Service Employees International Union (SEIU) and AFL-CIO represented in its Leadership Council.  Its lobbying arm is the Workers Defense Action Fund, which helps it to advocate for left-wing labor-union-aligned economic policies and against enforcing existing immigration laws. 
The Workers Defense Project was organized in August of 2002 by volunteers from a local Austin shelter, Casa Marianella.
For much of its early life, it was a mostly volunteer organization and remained small. It only began to increase in size and repute in 2006, when Cristina Tzintzun—who served as its first Executive Director—and Emily Timm officially co-founded the nonprofit, assuming leadership positions. At the time, they were both young: Tzintzun was a senior at the University of Texas, while Timm had just graduated from Brown University. 
The same year Tzintzun became Executive Director, the Workers Defense Project lead two major illegal immigrant protests in Austin.  According to the New York Times, which called Workers Defense Project “a union in spirit,” “The group limped along with insecure financing until 2009.” 
In August of 2016, Tzintzun stepped down and was replaced by the current president, Valerie Benavidez.
The Workers Defense Project operates in all the major Texas cities, including Austin, Dallas, Houston, and San Antonio. In each of its cities, its city-wide organizations hold regular weekly meetings that revolve around organizing education and planning future demonstrations.  It also conducts research on worker safety and payment agreements, often interfering directly in workplaces on behalf of its member workers.
Workers Defense Project signed a letter condemning the immigration policy of the Trump Administration and urging American CEOs not to employ anyone involved with the policy. 
In preparation for the Trump Administration’s planned June Immigration and Customs Enforcement agency raids, volunteers with the Workers Defense Project handed out “know-your-rights” leaflets to illegal immigrants in Texas cities. 
Valerie Benavidez is the current president of the Workers Defense Project.
Jose Garza, the executive director as of 2019, is its only paid officer. In June of 2019, Garza announced his candidacy for the Democratic nomination for Travis County District Attorney. In his announcement, he declared his intent to abolish cash bail and protect illegal immigrants. 
Tax filings from 2017 show total revenues of $3,365,086 and total expenses of $2,421,364.