MUMBAI, January 16: Trade unions led by the Kamgar Aghadi today protested the state government's failure to book the real culprits behind the ghastly murder of Datta Samant.On his first death anniversary on January 16, union leaders condemned the slack investigations and blasted the government for failing to make any headway even while using all its machinery to apprehend the music magnate Gulshan Kumar murderers. Dada Samant and Sharad Rao also made speeches.