POSTVILLE (AP) - Advocates of immigration reform and religious leaders from across the Midwest are planning a rally in Northeast Iowa about two months after a raid at a meatpacking plant resulted in nearly 400 arrests.

The event from 1 to 4 p.m. July 27 is being coordinated by Jewish and Catholic groups from Iowa, Illinois and Minnesota, and organizers expect to attract hundreds of people to town.

Advocates are using the raid at Agriprocessors on May 12 as an example of what's wrong with the nation's immigration laws. Federal officials called the enforcement action the largest single immigration raid in U.S. history.

"Our national immigration policies are tearing apart and hurting hardworking, taxpaying people who are just here trying to support their families," said Tom Walsh with the Jewish Council on Urban Affairs.

Walsh said more 175 families in Postville, including more than 500 children, "lost not only their mother or father, but in many cases, the sole breadwinner for their homes."

Authorities said some undocumented workers who were sole caregivers for children were allowed to return home with ankle bracelets that monitor their movement. However, advocates claim those parents aren't able to find work and must rely on handouts from churches and other groups.

Since the raid, allegations surfaced of unsafe conditions, child labor violations and abuse of low-paid workers by supervisors at Agriprocessors. Before the raid, the company produced about half of the nation's kosher beef and 40 percent of its kosher chicken.

Most of the 389 workers arrested were charged with using false identification or incorrect Social Security numbers.

Authorities later charged two plant supervisors with aiding and abetting possession and use of fraudulent identification.

An Agriprocessors spokesman did not respond to a request for comments.

Groups planning the rally are St. Bridget's Catholic Church in Postville, Jewish Community Action of St. Paul, Minn., and the Jewish Council on Urban Affairs of Chicago.

"This is a call for justice. This is a call to be faithful to our American and religious values," Sister Mary McCauley said in a prepared statement. "This is a call to stand in solidarity with our Hispanic brothers and sisters."

Organizers are worried that the rally could draw too many supporters and ask anyone planning to attend to register.

"We want to come out with a strong support, (but) we don't want to overwhelm the community," said Jane Ramsey, executive director of the Jewish Council on Urban Affairs.