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Middlesex Truck and Coach owner Brian Maloney, left, and son Brian Jr., walked with Mitt Romney.

Jim Davis/Globe Staff

Speaking at the Roxbury business, Romney accused President Obama of misunderstanding the nature of American entrepreneurship.

Jim Davis/Globe Staff

The company performs work on trucks, buses, and equipment.

Jim Davis/Globe Staff

Romney greeted workers during the visit.

evan vucci/associated press

Romney did not take questions after his appearance and left without talking to reporters.

essdras m suarez/globe staff

Protesters gathered across the street, and some chanted, “Shame on Romney, Shame on Bain,” when his motorcade arrived.

essdras m suarez/globe staff

Roxbury resident Nicholas Smith, a community organizer, said he came out to protest Romney’s economic strategy.

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Boston City Councilors Felix Arroyo, left, and Tito Jackson, second from right, spoke outside the event.