sentences:  Whenever the workforce was well-organized in unions - which was the case in around half of all cities with streetcar companies - any proposal of one-man operation would generally be challenged, regardless of whether the streetcar company was in serious financial difficulties.In many cities, it took a municipal ordinance to authorize one-man operation, thus also politicizing the subject.The end result of all this was typically strikes and other industrial action whenever one-man operation was implemented.