Nevertheless , Reza Shah was also a very harsh ruler who did not tolerate dissent .
Reza Shah began a rapid and successful modernization program in Persia , which up until that point had been considered to be among the most impoverished countries in the world .
Reza Shah was also a very harsh Reza Shah who did not tolerate dissent .
Reza Shah began a rapid and successful modernization program in Persia , which up until that point had been considered to be among the most impoverished countries in the world .