Large groups practicing the advanced Transcendental Meditation program were associated with significant reductions in U.S. homicide and urban violent crime rates during an intervention period of 2007–2010.
Summary: A new study, in a series spanning decades, suggests again that a sufficiently large group practicing an advanced program of Transcendental Meditation, the TM-Sidhi program, is associated with decreased violence in the whole society. From 2007–2010 the homicide rate dropped nationally 21.2% (5.3% per year), and violent urban crime dropped 18.5% (4.6% per year) for a sample of 206 urban areas nationwide with a population over 100,000. Both reductions were relative to prior trends, 2002–2006.
Read more here: http://tinyurl.com/h4bwa2h or https://theuncarvedblog.com/2016/04/14/can-group-meditation-prevent-violent-crime-surprisingly-the-data-suggests-yes-new-study/ and here: http://sgo.sagepub.com/content/6/2/2158244016637891