Citizens convicted of political crimes no longer constitute the bulk of the prison population, as they did during the early post-World War II period. Active or aggressively vocal opposition to the regime is usually called ideological subversion, diversion, or revisionism, and it is described as activity or expression of thoughts related to the old society and not in accord with the policies of the new. It is still listed among the more serious crimes. Officials of the Ministry of Internal Affairs blame both external influences and dissident internal factions for having caused the Hungarian revolution in 1956 and the Czechoslovak troubles in 1968. They say, however, that such events are unlikely in Bulgaria because the ministry's state security agencies are busy combating foreign intelligence efforts and the native elements that would bore from within. The success of their efforts is credited with having reduced political trials to only a few each year. Economic crimes include those of dishonest or illegal operation of an enterprise, the misuse of socialist property by its management or workers, currency manipulations, and improper sale or transfer of property. If inefficient management practices are serious enough to result in less than optimum production, they are considered criminal, but sufficient guilt has been difficult to prove, and those accused are rarely, if ever, prosecuted. They are occasionally reprimanded, transferred, or dismissed for bureaucratic practices. Management personnel who are brought before the courts are usually tried for corruption, using their positions for personal enrichment, or violation of administrative or financial regulations. Workers can be prosecuted for theft, waste, willful damage, or illegal use of materials. Poor labor discipline, shirking on the job, or nonmalicious negligence may result in individuals or entire work shifts being brought before party groups or trade union committees. Action in such cases usually involves counseling, social pressure, or the like. Consumption of alcohol is not excessive when compared with that of other European countries, but it has been increasing steadily and has been a major contributor to crime and antisocial behavior. During the 1960s per capita consumption of absolute alcohol increased by a factor of nearly 50 percent, from 4.01 quarts per person annually to 5.93 quarts. Strenuous efforts on the part of the country's leadership to combat the trend resulted in a decrease between 1968 and 1970, but the dip in consumption was temporary. Per capita consumption in 1971 reached the highest level yet recorded. Police are involved in aspects of the programs combating the rise in consumption of alcohol and alcoholism because alcohol has figured increasingly in crime. Nearly 90 percent of those charged with rowdiness or disturbing the peace were under its influence, as were increasing percentages of those apprehended on rape, assault, and murder charges.