Alliance Defending Freedom, the law firm that recently led two successful Supreme Court challenges to uphold state laws that protect women's sports, has sent a cautionary notice to the WNBA.ADF sent a letter to WNBA Commissioner Cathy Engelbert Friday after separate incidents involving Sophie Cunningham supporters at games in Seattle and Atlanta.Suzanne Beecher, legal counsel for ADF, told Fox News Digital that free-speech protections at the fed…