A clear example is Bogota, Colombia where street artists used graffiti as a reminder of the days when street violence was endemic, also to criticized the government and the police for being corrupt. They also are inspired by the indigenous culture.
Another country where Graffiti is used in Latin America is Argentina. In Buenos Aires graffiti is in a another level, superior. There, street artists turn the wall into a piece of pure art, making turning the streets into an open air art gallery, where the style and thoughts of the artist are demonstrated.
In Tegucigalpa (Honduras), one of the world's deadliest cities with more than 87 homicides per 100,000 people - 10 times the rate considered an epidemic of violence by the World Health Organisation; Maeztro, an artist armed with two boxes of spray paint cans, a notebook, and a Sharpie marker, plans to take over the six-metre long wall to express the reality of his country.
The street artists of Brazil, are influenced by the political climate and corruption in their country.Nunca and Os GĂȘmeos are among the most famous practitioners of Brazilian street art. Although their work received a kind of institutional seal of approval when the Tate Modern put on a major exhibition of street art in 2008, they never stopped making art outdoors.
Clearly graffiti is a manner to express ideas influenced by what is around us, a type of nonverbal communication, where the voice is not specifically needed but it keeps sending a message.