Answer
The Bella Twins turned heel in 2018 to feud with Ronda Rousey. This was a controversial decision, as the twins had been fan favorites for many years. However, it proved to be a successful move, as the feud generated a lot of interest and helped to increase ratings. The twins eventually lost to Rousey at WrestleMania 34, but they continued to feud with her for several months afterwards.