[en] This paper focuses on the uranium cartel - or marketing arrangement as its admitted participants styled it. The clash between US antitrust laws and cartels that fix prices is examined with particular emphasis on the uranium antitrust litigation and on a US antitrust lawsuit in which the courts rejected an attack on OPEC's price-fixing and output-limitation activities. Basic legal principles pertaining to this type of litigation are explained. Even more specialized defenses are available to complicate the litigation when foreign governments are involved with the cartel: sovereign immunity, act of state, and foreign governmental compulsion. It is concluded that antitrust litigation against a foreign cartel is not impossible, but it may be unwise in the long run if it precipitates an international reversion to protectionism. 35 references