In the context of evaluating theories in psychology, replication means doing a study with different methods or different types of samples

the values of the selma marchers was to bring   their ability to vote into law. mlk was not hat march, which was protesting toward lbj

an informal structure in a bureaucracy would be something like so-called "office politics". where there's a formal structure set up for the organization, but then an informal subculture as well that has a way of organizing the bureaucracy further. this can be positive because it sets up an added degree of organization, albeit informal, within the bureaucracy.