In its latest assault on the U.S. pork industry, the Humane Society of the United States (HSUS) has paid for ads on busses in Des Moines and Washington, D.C., that depict sows in gestation stalls.

The new ad campaign, covering entire buses in the two cities, aims to inform commuters about hog-raising practices and influence national pork policy, according to the Des Moines Register.

The HSUS is attempting to raise awareness about the “intransigence of companies and producers that continue to defend the use of gestation crates,” according to a news release posted on the group’s website. “These new ads shine a bright spotlight on a world of inhumane treatment that Big Pork would prefer remained hidden,” says Paul Shapiro, HSUS vice president of farm animal protection, according to the release.

According to the Des Moines Register report, HSUS paid $14,810 for the ad on one Des Moines bus.

Despite HSUS's television ads which depict abused cats and dogs, the animal rights group gives only 1 percent of its budget to pet shelters and also wants to put farmers out of business, according to watchdog group HumaneWatch.org.