From the Tampa Times: The organization, which launched a campaign called "Teach Kids Not Stereotypes" in 2012, investigated other school districts in Florida, said spokesman Baylor Johnson.
It chose Hillsborough for the complaint because "the records we turned up in our investigation were so egregious and showed widespread problems and violations of Title IX, we had to act quickly."
The complaint says Hillsborough paid about $100,000, much of it from federal sources, to outside consultants to help design the single-gender programs.
"What's especially problematic is when these sex-segregated environments are based on junk science or discredited stereotypes about how kids learn," Johnson said.
"When that's the case we're denying all students, not just girls but also boys, the opportunity for a fair education that treats them as individual students rather than simply based on their gender."