Cesar Chavez, a couple of weeks before his death on April 23, 1993.

Chavez’s UFW has pushed a boycott on table grapes for the past five years.

With this signing, the UFW now has contracts with 85 percent of the table grape growers.

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Cesar Chavez is visible in the second row of marchers.

Tens of thousands of farm workers marched and attended evening rallies to hear Chavez and organize their ranches.

César Chávez, a couple of weeks before his death on April 23, 1993. The civil and labor rights activist founded the National Association of Farm Workers in 1962, which would become the United Farm Workers (UFW) union in 1966.

Robert F. Kennedy sits next to César Chávez (looking very weak after a prolonged hunger strike) during a rally in support of the United Farm Workers union in 1968.

César Chávez (c) talks with grape pickers about the United Farm Workers union on March 1, 1968.

United Farm Workers (UFW) leader César Chávez (r) with UFW vice president Dolores Huerta during a grape pickers' strike on January 1, 1968.

Hands of a grower and a farm worker clasp in the background, as César Chávez (l) of the United Farm Workers (UFW) union and John Giumarra Sr., representing 26 of California’s largest table grape growers, exchange pens to sign a contract with the UFW on July 29, 1970, in Delano, California. Chávez’s UFW has pushed a boycott on table grapes for the past five years. With this signing, the UFW now has contracts with 85 percent of the table grape growers.

César Chávez, founder of the United Farm Workers (UFW), takes a break during work on the community garden at UFW headquarters in La Paz, California, in 1975.

The United Farm Workers (UFW) 1,000 Mile March approaches Malibu, California, in the summer of 1975. César Chávez is visible in the second row of marchers. The march was a 59 day trek organized by the UFW, from the Mexican border at San Ysidro to Salinas and then from Sacramento south down the Central Valley to the UFW’s La Paz headquarters at Keene, southeast of Bakersfield, California. Tens of thousands of farm workers marched and attended evening rallies to hear Chávez and organize their ranches.

Helen Chávez gives her husband César Chávez a foot rub during a break in the 1,000 Mile March through California during the summer of 1975. The march was a 59 day trek organized by the UFW, from the Mexican border at San Ysidro to Salinas and then from Sacramento south down the Central Valley to the UFW’s La Paz headquarters at Keene, southeast of Bakersfield.

In 1978, Labor Secretary Ray Marshall, right, hands a pen to César Chávez, president of the United Farm Workers union, during a ceremony at which the DOL signed a $500,000 contract with Chávez to provide English language training and other services to approximately 1,500 migrant and seasonal farm workers.

UFW president César Chávez, his mother Juana Estrada Chávez, and the Rev. Jesse Jackson at the Mass during which Chávez ended his 36-day Fast for Life, in 1988. Jackson, in solidarity, embarked on his own three-day fast on that day.