Sacco and Vanzetti were two working class, italian immigrants in the USA, but they were also anarchists. Their political ideas were influenced by the ideas Russian anarchists like Mikhail Bakunin and Piotr Kropotkin.
Since politicians did not want revolutionary ideas like communism or anarchism to expand in the United States and suffer a social uprising like the Russian revolution, communists and anarchists were usually targeted by the police.
In addition to that, racism and nativism in favour of white european, especially white anglo saxon people aslo contributed to the profiling of certain ethnic groups.
Since Sacco and Vanzetti were italian immigrants and also anarchists, they were immediately targeted as guilty of robbery and murder, even though there were no definitive evidence.
Ecology is the study of interactions between the environment and living creatures.
This depends greatly on the time period in question, since for a long time it was Irish immigrants who were coming to the United States in great numbers, but yes, mostly it was German immigrants.
The Environmental Protection Agency (EPA) was proposed by the President Nixon, this Agency followed a set of measures aimed to improve air quality, to avoid water pollution, to reduce the emission of dangerous fumes and to invest in preventive strategies against oil spills. The EPA had many responsibilities in the United States, two of them were to research about pollutants and to set standards for factories to reduce their impact on the environment.