Aetna Insurance Co. is facing a class action over claims that it failed to protect the privacy of HIV patients by mailing sensitive information in see-through envelopes.

According to the complaint, filed in Philadelphia-based federal court, Aetna has been sued for this alleged conduct before: two separate putative class action lawsuits in 2014 and 2015 were settled with Aetna paying the individuals $24,000 and paying their lawyers an undisclosed sum.