(CNN)Brazil's bright yellow jersey is a symbol that unites the country through a love of football and national pride, but over the past two years the shirt's adoption by right wing supporters of Jair Bolsonaro, who wear it at protests and rallies to show their political allegiance to the Brazilian president, is causing controversy.

That famous yellow jersey was burnt into the imagination of a global audience in the 1970 World Cup. Inspired by the spelbinding performances of Pelé -- he…