Collusion means "secret agreement or cooperation esp. for an illegal or deceitful purpose." If "rightfully" means legally, then it follows that no group of people can legally use a secret agreement or cooperation to illegally restrict or deny individual rights. Hence, the statement is true. It does not follow, however, as you German-speaking "objectivists" seem to think, that no group of people can use the constitutional process to legally restrict what any particular individual may see as his "rights." If that were the case, each individual could decide for himself whether to obey or ignore any particular law, including constitutional law, created and applied by our representative democracy through the institutions provided by the Constitution. All laws restrict an individual's conduct or provide for punishment if that conduct violates the law.