Who did the pinkertons work for

Early 21st Century businessmen

Explanation:

they used them in order to infiltrate whoever was with the strike and to intimidate workers

separate but equal was a legal doctrine in united states constitutional law according to which racial segregation did not violate the fourteenth amendment to the united states constitution, which guaranteed "equal protection" under the law to all people. under the doctrine, as long as the facilities provided to each race were equal, state and local governments could require that services, facilities, public accommodations, housing, medical care, education, employment, and transportation be segregated by race, which was already the case throughout the states of the former confederacy. the phrase was derived from a louisiana law of 1890, although the law actually used the phrase "equal but separate

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the correct answer is:   the domino theory states that if one country in a region came under the influence of communism, then the surrounding countries would follow in a domino effect.