The reason why labour leaders praised the Clayton Antitrust Act was because the Act prevented unions from being treated as trusts.
Not sure what you're looking for exactly, but they were certainly risking their lives and livelihoods. African-Americans weren't the only people to be lynched in the fight against racism- black and white abolitionists were at risk as well (though certainly whites to a lesser degree).
The correct option is BRITAIN DID NOT WANT TRADE WITH COLONIES TO ENRICH ITS COMPETITORS.
Mercantilism is a form of economy policy which was designed to maximize the trade status of Britain and ultimately to increase the wealth of the nation. The policy encourage exporting of goods but discourages importing. Also, the policy forbid the colonies from trading with other nations.
Martin Luther King as a preacher, pastor and civil rights leader during the Civil Rights movement in The United States during the sixties.