I have come across this term frequently in banking investigation reports. Just as you have mentioned, a Turkish bank prefers the term "embezzlement" and "embezzlers". Also, there are many sites mentioning "nitelikli" as "major" on google.

major/qualified swindle (swindlers)

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Note added at 9 mins (2007-02-15 16:49:27 GMT)
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Hi Louis, "nitelikli" literally means "qualified", and such actions/offences to be committed by "qualified" persons, with either positive or negative meaning, in your case. "Dolandırıcılık" means fraudulent act, namely swindle.

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Note added at 16 mins (2007-02-15 16:55:55 GMT)
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Well;

White-collar crimes are those crimes specifically performed by professional workers. They include certain forms of fraud, insider trading, embezzlement and forgery. Such crimes are often contrasted against violent crimes (such as rape or murder) or blue-collar crime (such as vandalism or shop-lifting). The term derives from the characteristic white-collar shirts worn by lawyers, bankers and other professionals associated with such crimes.

Also;

White-collar workers are employees who perform clerical or knowledge work, such as those in clerical, professional, managerial or administrative positions, in contrast to blue-collar workers, who do manual work.

The name derives from the traditional white, button down shirts worn by workers of such professions. As white shirts are easily soiled, these workers do not do manual labor.

Formerly a minority in the agrarian and early industrial societies, the recent technological revolution has created disproportionatly more Desk jobs while America has experienced a decline in manufacturing. Generally, the pay rate is higher among white-collar workers, although many of the "white- collar" workers are not necessarily upper class as the term once implied.

However;

In this sense, a qualified swindler does not need to be "well-trained" or "educated" to be qualified. S/he can acquire some valuable information, from many other ways, in order to commit such qualified actions.

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Note added at 2 hrs (2007-02-15 19:11:10 GMT)
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Pls see a previous proz question below:
http://www.proz.com/kudoz/900424

En az İngiltere'de böyle geçer:
www.sfo.gov.uk
www.seriousfraud.com

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Note added at 16 hrs (2007-02-16 08:57:19 GMT)
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Also used in the US: appears highlighted in yellow in this court ruling:
http://209.85.135.104/search?q=cache:krYFybawLT0J:pacer.ca4....

In connection with such cases, you should consider having the one-to-one translation of this indictment, or, what it means for the target language readers.

I believe this phrase covers the meaning of the indictment referred above according to US law.