Sign of Desperation in Iran?

For the hardline goverment of Ahmadinejad (article here):

Iran is in the throes of one of its most ferocious crackdowns on dissent in years, with the government focusing on labor leaders, universities, the press, women’s rights advocates, a former nuclear negotiator and Iranian-Americans, three of whom have been in prison for more than six weeks. The shift is occurring against the backdrop of an economy so stressed that although Iran is the world’s second-largest oil exporter, it is on the verge of rationing gasoline. At the same time, the nuclear standoff with the West threatens to bring new sanctions.

Why?

Most ascribe Mr. Ahmadinejad’s motives to blocking what could become a formidable alliance between the camps of Mr. Khatami and Hashemi Rafsanjani, both former presidents. Parliamentary elections are scheduled for early next year, and the next presidential vote in 2009.

The X-factor of course is an American attack which would unite everyone and give the radicals nearly complete power.