 In the 1930s the city 's transportation system was marred by violent protests . Transit workers wanted to unionize , and with the main company 's management against any effort to change Omaha 's reputation as a non @-@ unionized city . After the introduction of buses in the early 1950s , streetcars were closed down , and in the last years of the decade the city began construction on its components in the Interstate Highway System . 
 In the 1930s the city <a href='null_genetive' title='1'><mark>'s</mark></a>transportation system was marred by violent protests . Transit workers wanted to unionize , and with the main company <a href='null_genetive' title='2'><mark>'s</mark></a>management against any effort to change Omaha <a href='null_genetive' title='3'><mark>'s</mark></a>reputation as a non @-@ unionized city . After the introduction of buses in the early 1950s , streetcars <a href='uninflect' title='4'><mark>were</mark></a> closed down , and in the last years of the decade the city began construction on its components in the Interstate Highway System . 
In da 1930s the city  transportation system was marred by violent protests . Transit workers wanted to unionize , and with the main company  management against any effort to change Omaha  reputation as a non @-@ unionized city . After the introduction of buses in the early 1950s , streetcars was closed downn , and in the last years of the decade the city began construction on its components in the Interstate Highway System .