What began in May 2006 as a dispute about teachers' pay has grown into protests, with human rights activists fearing increased repression. The People’s Popular Assembly, or A.P.P.O., has accused the government of corruption and authoritarianism and are demanding change in the conditions in schools, as well as for better teacher wages. At least 50,000 people protested on the streets, protests have been held for years. Through the years the protesters' cause has not changed, but has been exacerbated by the violence brought on by authorities. Other unions, like the Coordinadora Nacional de Trabajadores de la Educación (CNTE), have joined the cause. In 2013, more than 70,000 state teaches spent five months protesting in Mexico City to stop education reforms. The changes include requiring teachers to undergo mandatory standardized performance tests to get jobs or promotions. During this time, more than one million students were unable to attend classes.