The wildcat strike by employees of the Pullman Company in 1894 was:

Answer

The wildcat strike by employees of the Pullman Company in 1894 was not approved by a union.

Explanation

The Pullman Strike was a nationwide railroad strike in the United States. It was happened from May 11 to July 20, 1894 as a turning point for US labor law.

The Pullman Strike pitted the American Railway Union (ARU) against the Pullman Company, the main railroads, and the federal government of the United States under President Grover Cleveland. Because of Pullman strike, there are the boycott which shut down much of the nation's freight and passenger traffic west of Detroit, Michigan. The conflict began in Pullman, Chicago, on May 11. Nearly 4,000 factory employees of the Pullman Company began a wildcat strike in response to recent reductions in wages. 30 workers were murdered by railroad agents and their allies. A wildcat strike action itself is a strike action taken by unionized workers without union leadership's authorization (unofficial industrial action).

Because it was action without union leadership's authorization, support, or approval, wildcat strike by employees of the Pullman Company in 1894 was not approved by a union.