A law firm hired by the Humane Society of the United States is conducting an internal investigation. They’ve identified three complaints of sexual harassment by chief executive Wayne Pacelle and found that senior female leaders said their warnings about his conduct went unheeded.

The investigation also found the nonprofit agency, one of the country’s biggest animal charities, had offered settlements to three other workers who said they were demoted or dismissed after reporting Pacelle’s alleged behavior, according to the Humane Society memo.