In response to U.S.-funded attempts to eradicate and fumigate coca crops in the Chapare region of Bolivia, cocaleros joined with other grassroots indigenous organizations in the country, such as unionized mine workers and peasants to contest the government.
Plan Colombia sent hundreds of millions of dollars in military aid, training and equipment to Central and South American countries, thereby militarizing the region and local and national governments' responses to coca production.
Cocaleros who make their livings growing and selling coca were the most negatively affected by the policies, as their crops were burned, ripped up, or sprayed with herbicide.
Also the anti-drug militancy has targeted left wing guerrilla groups like the Revolutionary Armed Forces of Colombia and gangs who are involved in the drug trade.
It received training and monetary aid from the American Drug Enforcement Administration and led raids on coca fields and suppressed cocalero organizing.
The momentum of the MAS party led to the successful election of Evo Morales, a cocalero union organizer, with a 54% absolute majority.