Answer: Right in the beginning of your assignment/essay.
Explanation: Your introduction introduces what you will be presenting/saying/debating in your essay/debate/assignment/etc. Because you don't want to introduce what you are doing in the middle of your assignment or at the end, you would put your introduction right in the beginning.
This excerpt shows that while Martin Luther King Jr and Gandhi are two of the most widely known civil protesters they are not the first nor the most important.
