How can you convince your manager that a smaller group would be better-How do you deal with John if your manager insists on him being in the group?

Examine the Nazi ideology in wiping out an entire ethnic group.
How could any modern and so-called advanced and evolved nation like Germany go along so willingly with the mass murder of at least 11 million civilians?
How were the Germans able to construct the facilities they built for their “Final Solution to the Jewish Question” so as to commit genocide on an industrial scale?

Scenario 1: A colleague from another country has limited English-speaking skills and does not comprehend the group task. Additionally, this colleague has the habit of giving gifts to business associates at the end of projects. Gift-giving is an expected part of business etiquette in her culture. How do you deal with these issues to ensure the success of the group? What criteria would you set early on in the process?

Scenario 2: Your manager asks you to take on a new project that you think you could take on by yourself. He suggests that you form a task group with 15-20 members, which you think is too much. One of the members he recommends adding to the team is John. This gives you additional concern because you think John has had hidden agendas in the past. Even though you think you can do this on your own, how is a group decision different from an individual decision? How can you convince your manager that a smaller group would be better? How do you deal with John if your manager insists on him being in the group?