Upvote:5
There is indeed one such record of protest action except the name of the US singer who performed it is not Paul Robeson, but Dean Reed, as seen here:
The famous US singer, songwriter, actor and director Dean Reed washed the flag of the United States (stained with the blood of millions of people in many countries, he said) in front of the US Embassy in Santiago de Chile on 1 September 1970, a week prior to the election of Chilean president Salvador Allende.
He was arrested by the Chilean police immediately there and then, but the world-renowned Chilean poet Pablo Neruda helped him to get out of jail. Some believe this played some part in the victory of the Unidad Popular (coalition of socialist and communist parties of Chile) led by Allende during that presidential election by a narrow margin of less than 1% which was overthrown by a bloody military coup d'Γ©tat heavily backed by Washington in 1973.
Note: Thanks to Herbert Griessig for this answer offered on Facebook. Apparently I confused the name of the singer probably because I heard about this through a poem written for Dean Reed (which also mentioned Paul Robeson).