T/F: A Muckraker was a crusading journalist from the early 1900's who believed in righting social wrongs by protecting big business and big government.

False.

Explanation:

Muckraker were the journalists of the Progressive Era in America, who brought to light and exposed the corruption of the big companies and big government. The term 'muckraker' was used by President Theodore Roosevelt in his speech that was delivered on 14th April 1906. He borrowed the word from John Bunyan's "The Pilgrim's Progress."

The writers and journalist of the Progressive Era used their power of writing to bring to light the corruption, social and economic injustices done by the big government and businesses.

The writers or the promoters were mostly women. Ida Tarbell and Ida B. Wells just to name a few famous women muckrakers.

So, given the statement is false because muckrakers believed to right the social wrongs by NOT protecting big businesses and government but by exposing their corruption.

So, the correct answer is false.