LOS ANGELES — A national labor union launched a campaign Monday against Countrywide Financial Corp., calling on members and other consumers to boycott the mortgage lender's banking subsidiary until it guarantees it won't foreclose on borrowers who have fallen behind on adjustable rate loans.

UNITE HERE, which represents more than 450,000 workers in the apparel manufacturing, hotel, restaurant and retail industries, asked consumers not to make deposits at Countrywide Bank and to send e-mails to the company demanding assurances it won't foreclose on borrowers with mortgages that reset last year and this year.

Calabasas-based Countrywide and other lenders have been under intense pressure from lawmakers, consumer groups and others to do more to help stem a sharp increase in foreclosures.

The union worries that Countrywide's loan modification efforts will focus on borrowers who have yet to see their home loans reset, ignoring thousands of others who fell behind beginning last year, said Zakia Henderson-Brown, a research analyst for the union.