Often the best of the gangster films are those that have been closely tied to the reality of crime, reflecting public interest in a particular aspect of criminal activity; thus, the gangster film is in a sense a history of crime in the United States. The institution of Prohibition in 1920 led to an explosion in crime, and the depiction of bootlegging is a frequent occurrence in many mob films. However, as the 1930s progressed, Hollywood also experimented with the stories of the rural criminals and bank robbers, such as John Dillinger, Baby Face Nelson, and Pretty Boy Floyd. The success of these characters in film can be attributed to their value as news subjects, as their exploits often thrilled the people of a nation who had become weary with inefficient government and apathy in business. However, as the FBI increased in power there was also a shift to favour the stories of the FBI agents hunting the criminals instead of focusing on the criminal characters. In fact, in 1935 at the height of the hunt for Dillinger, the Production Code office issued an order that no film should be made about Dillinger for fear of further glamorizing his character. Many of the 1930s crime films also dealt with class and ethnic conflict, notably the earliest films, reflecting doubts about how well the American system was working. As stated, many films pushed the message that criminals were the result of a poor moral and economic society, and many are portrayed as having foreign backgrounds or coming from the lower class. Thus, the film criminal is often able to evoke sympathy and admiration out of the viewer, who often will not place the blame on the criminal's shoulders, but rather a cruel society where success is difficult. When the decade came to a close, crime films became more figurative, representing metaphors, as opposed to the more straight forward films produced earlier in the decade, showing an increasing interest in offering a thought provoking message about criminal character. An additional factor concerning public attitudes was the rural bank robbers operating in the Midwest and in the South were usually WASPs or at least of German descent unlike the gangsters in urban areas who were often Italian-Americans, Irish-Americans or Jewish-Americans. The fact that many gangsters in the cities had Italian, Irish or Ashkenazi surnames was used by xenophobes at the time to argue