 Also in August, a labor lawyer, Natalya Sokolova, was sentenced to six years in jail for 'organizing illegal gatherings' at the smaller Karazhanbas field, which was also on strike.Earlier, in July, the singer Sting had cancelled a concert after he was briefed on the strike by Amnesty International.These labour strikes were causing a 6% output drop in KazMunayGas production, according to a company spokesman.