Surveying history, one struggles to find good examples of advanced, developed economies slowing down development of any technology with a nebulous definition, obvious wide-ranging short to medium term economic benefits, and rich penetration into multiple industry sectors, due to reasons of speculative perceived long-term risks.
The government restrictions on cryptography is surely the nearest example within IT.
The government also restricts basic "intellectual development" activities, such as "copying stuff" and "inventing stuff".
Neither of those examples presents a resounding success story. Restrictions on cryptography proved infeasible, and were abandoned; copyright prohibits duplication of others' work only when it's for profit, and is only sporadically effective even at that.
Ben Goertzel and Joel Pitt: Nine Ways to Bias Open-Source AGI Toward Friendliness. Journal of Evolution and Technology - Vol. 22 Issue 1 – February 2012 - pgs 116-141.
I'd say it's worth a read - they have pretty convincing criticism against the possibility of regulating AGI (section 3). I don't think that their approach will work if there's a hard takeoff or a serious hardware overhang, though it could maybe work if there isn't. It might also work if there was the possibility for a hard takeoff, but not instantly after developing the first AGI systems.