During World War II Beöthy designed fliers for the French Resistance.
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There he was in contact with the avant-garde poet and painter Lajos Kassák, who familiarized him with the tenets of constructivism and suprematism.
István Szabó | István Tarlós | Istvan Javorek | István Anhalt | Zoltan Istvan | Istvan Kantor | SMS Szent István | István Várdai | István Türr | István Tisza | István T. Horváth | István Thomán | István Szent-Iványi | István Mudin | István Lülik | István Kovacsóczy | István Gyenesei | István Geleji Katona | István Gaál | István Bujtor | István Bibó | István, a király |