From the article:

...... Since mid-2011, at least 34 civilians have been killed and nearly 1000 wounded in social conflicts in Peru, mostly involving clashes between police and anti-mining protesters.

One of the most prominent cases is that of Elmer Campos, a 34-year-old farmer from the hamlet of Bambamarca. Campos received severe spinal injuries after being shot in the back by police during peaceful anti-Conga protests on November 29, 2011. Doctors say he will never walk again.

.......

The new law represents a green light for repressive acts, including murder.

The passage of the law has horrified many who remember Peru’s recent past. More than 60,000 civilians were killed by the state during the troubles of the 1980s and '90s.

In the name of combating a violent leftist insurgency, the Peruvian military engaged in its own form of terrorism. In the highlands of Ayacucho, torture of suspects and Vietnam War-style mass killing of villagers by military units became commonplace.

Washington provided extensive support for these operations, which were routinely accompanied by CIA advisers. The perpetrators of these atrocities have never faced justice. Law 30151 represents a reversion to these dark days, a huge setback to the emerging rule of law in Peru.

.......

As significant segments of the population turn against the destruction of their environment and livelihoods, Western-backed neoliberal regimes use repression to quell dissent.

Peru, which remains a strong ally of the US in the Andean region, conforms to this international trend. The irony is that Humala was elected on a left-leaning nationalist platform, promising to respect the right of local communities to oppose resource extraction projects.