  This Introduction opens the collection "Physics in A Mad World" devoted to
two outstanding physicists whose destinies were deeply intertwined with the
tragedies and drama of the times in which they lived. Friedrich (Fritz)
Houtermans was the first to understand why stars shine. He endured Stalin's
prisons in the Moscow of the late 1930s, then faced the Gestapo in Germany. In
the early 1970s, Yuri Golfand was among the discoverers of theoretical
supersymmetry, a concept which completely changed mathematical physics in the
21st century. After his discovery, his research institution in Moscow fired
him. He knew the humiliations of the Brezhnev regime firsthand, blacklisted and
unemployed for the rest of the decade due to his desire to emigrate to Israel.
This introduction gives a detailed review of background and supplemental
information to the events described in the three main essays authored by V.
Frenkel, B. Eskin and B. Bolotovsky who presented captivating stories of the
physicists' lives, as told by their friends, colleagues and relatives.
