NEW YORK – Protesters calling for pay of $15 an hour and a union were at McDonald’s restaurants around the country and overseas Thursday as part of an ongoing push targeting the world’s biggest hamburger chain.

The “Fight for $15” campaign says low-wage employees including airport workers, adjunct professors and home care workers turned out to show their solidarity with fast-food workers. They say they’re targeting McDonald’s because of its ability to influence pay practices throughout the economy.

The push is being backed by the Service Employees International Union and began in late 2012, with striking fast-food workers in New York City. Since then, the growing demonstrations have helped make hourly pay a major political issue. The success has prompted organizers to expand their push to energize new swaths of workers to fight for higher pay and unionization.

Organizers said strikes and protests were planned for cities including Boston, Chicago, Los Angeles and Miami. In Paris, about 100 people waving red union flags protested outside a McDonald’s restaurant at Disneyland.

In New York, demonstrators were planning to march crosstown to a Republican gala in the early evening.

The campaign is taking place as McDonald’s Corp. tries to reinvigorate its business and win back customers. This week, executives met with franchisees in Florida for a bi-annual convention and discussed plans for a rebound.