In this post from 2001online on Flickr they say:

Samba school members sing as they march toward the Sambadrome during a protest against mayor Marcelo Crivella in Rio de Janeiro, Brazil, Saturday, June 17, 2017. The samba schools are protesting the decision by Crivella to cut carnival funding in half for the 2018 Carnival parade. (AP Photo/Leo Correa)