 The Sindhis fought back to resurrect their dying culture and in 1972, according to the Sindh Act, imposed the teaching of Sindhi language compulsory in schools all over the province of Sindh.These actions led to the first violent clashes involving muhajir groups.The 1980s saw a black period in the history of Hyderabad as riots erupted in the city between the two ethnic diversities in majority, the Sindhis and the Muhajir.