In reply, the federal government restricted movement of the dam workers to Las Vegas. Smuggling and circuitous routes then were developed. In 1934, to curtail these activities and the resulting growth of criminal figures in the gambling industry, the city's leading figures purged gambling dens and started an effort to stem the flow of workers from the dam. This only emboldened some dam workers who still contrived to visit Las Vegas. A celebration of this era has become known as Helldorado Days.