Gaining investor's trust is fundamental feature in any successful capital market. Unfortunately, this is the most attacked point by various types of illegal transactions, practices or unethical behaviour in nowadays society. The aim of this diploma thesis is to examine the function of investment intermediaries and their tied agents and to analyse financial frauds practiced by them. Iniquities of these participants disrupt trust in the capital market as well as natural development. Capital market in the Czech Republic is relatively young industry in the financial sector which is searching for a way to excellent performance by means of changes, regulations, measures of the law etc., therefore I consider fighting against this kind of practices...