By Kris Maher and Drew FitzGerald 

PITTSBURGH--A postal-workers union is ramping up a campaign to try to slow the U.S. Postal Service's partnership with Staples Inc., including asking unionized teachers to boycott the chain and buy school supplies elsewhere.

Last fall, Staples began providing postal services under a pilot program that now includes 82 stores in California, Pennsylvania, Georgia and Massachusetts. The sites are staffed with Staples employees.

The American Postal Workers Union, whose members have average pay of just under $25 an hour, said it fears a broader rollout would end up transferring more duties to lower-paid Staples employees, cutting the need for neighborhood post offices and leading to post-office layoffs. The union represents 200,000 postal workers, or roughly half the total.

On Thursday, the union plans to hold protests at 56 Staples stores in 27 states. It also recently asked the nation's biggest teachers unions to urge their members to purchase school supplies through other retailers. The California Federation of Teachers, with 120,000 members, plans to vote on such a resolution on April 28.

Staples spokesman Mark Cautela declined to comment on the union's criticisms. "Staples continually tests new products and services to better meet the needs of our customers," he said.

The postal service is seeking a way out of a deepening financial crisis as more people use email and pay bills online. The agency had an operating loss of $5 billion for the year ended Sept. 30, with $61 billion in liabilities, including for retiree health benefits, compared with about $20 billion in assets. Between 2007 and 2013, total mail volume in the U.S. fell 25%. Still, online shopping has boosted its package business, which rose 8% last year.

In the past decade, the postal service has teamed up with many retailers, from CVS Caremark Corp. to Wal-Mart Stores Inc., to offer stamps and limited services at a total of 65,000 locations--including boxes with prepaid postage at some stores. But the partnership with Staples is the first time a retailer has been allowed to effectively set up a mini post office in-store.

Postmaster General Patrick Donahoe said the goal of the partnership is to expand access to services--including package shipping--and won't result in job losses at the nation's 33,000 traditional post offices: "Partnerships like the one we have with Staples are all about growing our business."

The union, however, argues the agency's primary goals are to lower costs and privatize services. "The idea that it's not going to represent a shift of work and eventual closing of post offices is just wrong," said Mark Dimondstein, its president.

Staples has experimented with other ways to improve store traffic. It tested a partnership with Amazon.com Inc. that allowed the online retailer to put shipping lockers in stores, but Staples scuttled the program last year.

Last month, Staples said it plans to close as many as 225 stores over the next two years in an effort shrink its physical footprint. Staples is the nation's second-largest online retailer by sales behind Amazon, according to trade publication Internet Retailer.

The postal service said in a December 2012 internal memo that the purpose of its program to expand services to stores including Staples was to determine "if lower costs can be realized with retail partner labor instead of the labor traditionally associated with retail windows at Post Offices." The memo said an initial analysis suggested that retailers can sell postal products and services at less than a third of the cost at post offices.

The union has also criticized the fact that the postal service will grant Staples discounts on certain products, according to a copy of the agreement between the retailer and the agency. The postal service is "providing Staples with a discount so that Staples can make a profit," Mr. Dimondstein said. "That's very troubling."

Darleen Reid, a spokeswoman for the postal service, declined to provide information about discounts to Staples, saying the agreement, like those with other retailers, is confidential. She said the program is mainly about expanding market share but that it "can lower costs for the postal service while simultaneously increasing customer convenience."

Customers in line Tuesday at a Pittsburgh post office said they visited the location because it was within walking distance from work or they had a post-office box there.

At a Staples store a few blocks away, others stepped up to a counter beneath a white-and-blue United States Post Office sign next to postal boxes and envelopes. Evelyn Castillo, a 54-year-old event planner with two boxes and a stack of postcards under her arm, said the wait was usually shorter at Staples. "It's a convenience," she said.

Write to Kris Maher at kris.maher@wsj.com and Drew FitzGerald at andrew.fitzgerald@wsj.com

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