Final answer:
The Silent Sentinels were suffragists from NWP who protested outside the White House; they helped draw attention to women's suffrage but faced harsh treatment and alienated some moderates.
Step-by-step explanation:
The Silent Sentinels were suffragists who protested outside the White House, lobbying for the constitutional right of women to vote.
The movement was primarily associated with the National Woman's Party (NWP), led by Alice Paul. The benefits of this campaign were its effectiveness in drawing media attention and putting political pressure on President Woodrow Wilson, which ultimately helped in gaining support for the Nineteenth Amendment. However, the drawbacks included the alienation of moderate potential supporters and the severe treatment of protestors, including arrests, beatings, and force-feeding during hunger strikes.
The campaign's rigorous approach signified a pivotal moment in the fight for women's suffrage, with both its commendable achievements and significant sacrifices.