Two years after sweeping into office in the tea party wave of 2010, noisily promising to be a wake-up call for GOP leaders on spending issues, many House Republican freshmen are trying a new tact: quiet unity.

They have responded with near silence as a group largely controlled by House Speaker John A. Boehner removed four sometimes-defiant members, three of them freshmen, from plum committee assignments, partly in retribution for two years of rebellion that, at times, constrained and frustrated his leadership.