Who was Gangubai Kathiawadi & what's the controversy around the movie on her?

Ganga Harjeevandas (aka Gangubai) Kathiawadi from Gujarat became popular as one of Mumbai's well-known and influential brothel owners in the 50s and 60s. She's known to have lobbied for commercial sex workers' rights and her adopted children have objected to her portrayal as a prostitute in her biopic. One of them said it affected reputation of his family's women members.