Conservatives have called the group's stances against capital punishment and for abortion rights, as well as its advocacy of affirmative action in worker discrimination cases, "extreme" and "shocking." Some have suggested Sotomayor's longtime association with the group is an indication that she is biased and would be unable to render impartial decisions as a Supreme Court justice.
The critiques leading up to next week's Senate hearings on Sotomayor's confirmation have stunned Perales, who calls them an attempt to derail her nomination by over-politicizing the work of his legal defense fund.
"You have a reputable group that has stood up for the civil rights of Latinos for 37 years," said Perales, the group's president. "To suddenly be accused of being something bad, and that anyone associated with it should not be allowed to serve on the Supreme Court, to me is shocking."
Perales founded the fund, now known as LatinoJustice PRLDEF, in a Manhattan office building in 1972, He modeled it after one of the most high-profile civil rights organizations in the country, the NAACP Legal Defense and Education Fund.
The group points to suits like Aspira vs. New York City Board of Education as among its biggest accomplishments, forcing city schools to implement bilingual education for non-English speaking students.
Another suit against the city's police department brought about an increase in the number of Latino officers in the police force. The group mounted a successful legal challenge in 1981 that postponed city elections over concerns about redistricting.
Sotomayor held leadership roles on the legal defense fund's board from 1980 to 1992, starting soon after she graduated from law school and began working, leaving it when she became a federal judge. Perales has described her role as helping with fundraising and setting policy and said she was not directly involved with the group's legal arguments and activities.
In that period, the group brought several lawsuits in which minority workers claimed discriminatory treatment that kept them from jobs or promotions.
Sen. Jeff Sessions of Alabama, the top Republican on the Senate Judiciary Committee, used the word "extreme" to describe the PRLDEF's views on capital punishment and race.
"This is a group that has taken some very shocking positions with respect to terrorism," Sessions said, citing the legal defense fund's defense in 1990 of Puerto Rican nationalists who 36 years earlier had wounded five lawmakers during an attack on the U.S. House of Representatives.
Sessions' Senate aides also raised concerns about the legal defense fund's ties with the community activist group ACORN, an organization embroiled on voter registration disputes with Republicans.
Perales said his group and ACORN were associated in one lawsuit that dealt with low-income tenants, an area of interest for both organizations.