Columbia subject headings:
Blank, Gregory Lex.
Commercial criminals--South Africa--Biography.
Johannesburg Stock Exchange.
Stockbrokers--South Africa--Biography.
Harvard subject headings:
Blank, Gregory Lex.
Commercial criminals--South Africa--Biography.
Johannesburg Stock Exchange.
Securities fraud--South Africa.
Securities industry--Corrupt practices--South Africa.
Stockbrokers--South Africa--Biography.
Princeton subject headings: