Both jokers, the ace of spades and the front of the box show a black fist. On the ace of spades and the box it's a raised black fist, also known as the Black Power fist. In the 1960's it was the symbol of the Black Panther Party, a movement for black nationalism that had its roots in Oakland, CA. It started as an armed monitoring of police brutality and discrimination by officers of the Oakland police force, but later the movement spread to other cities, like Chicago and Seattle, and social and community programs were set up, as well as medical clinics. Due to heavy oppression by the government and local authorities the support for the movement diminished and by 1980 the Black Panther Party had only 27 members left.
On the jokers the black fist is above the white fist, which stands for white nationalism, and that position says it all.
The courts are colourful:, they are dressed in suits and garments that would have been called "hip" in those days and express the "Black is Beautiful" feeling. The kings all have a raised fist, the queens hold a flower. In the red suits the kings and jacks seem to have been made older by suggesting gray hair.

The name of the artist who designed the cards isn't mentioned anywhere. The deck was printed in the US, but the name of the printer isn't mentioned either. What is mentioned is that the deck was published by the Soul-Mar Inc. from Whittier, California, in 1973.