From The Hill June 29, 2016 regarding contribution by Suffolk Construction:

EXCLUSIVE: Pro-Hillary group takes $200K in banned donations

A super-PAC backing Hillary Clinton has accepted $200,000 in donations from a company holding multiple contracts with the federal government — despite a ban on such contributions.
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At the time it made the contributions, Suffolk held multiple contracts worth $976,560 with the Department of Defense for maintenance and construction projects at a Naval base in Newport, R.I., and the U.S. Military Academy in West Point, N.Y., according to the government website USASpending.gov.

Here's the Open Secrets link to the contributions made in July and December 2015:

Two days after the story breaks, the money is refunded - from The Hill July 1, 2016:

Pro-Clinton PAC returns banned donations

After a review of federal contracting and campaign finance records, The Hill found that Suffolk had given $200,000 to the PAC, while, according to USAspending.gov, holding multiple contracts with the Department of Defense worth $976,560.

The site’s records show that the contracts were for fiscal 2016.

The ban on contributions from federal contractors is a longstanding law meant to prevent pay-to-play deals between companies receiving taxpayer money and public officials.

Since the first contribution was a year ago, the second was 6 months ago or so, there were plenty of time to reverse this voluntarily should either party have wished it or seen a necessity. The Priorities USA FEC page does not have the refund given. So it appears that The Hill article provoked the refund in the past few days.

Perhaps this reflects an attitude of: 'It's not illegal if we don't get caught,' which of course is not far off from 'It's not illegal if the president does it...'

Good job on THIS, The Hill!

Is less democratic form, however, The Hill is one of the rags selling access to their staff at the conventions: Major Political News Outlets Offer Interviews for Sale at DNC and RNC Conventions

FOR HIGH-ROLLING special interests looking to make an impression at the presidential conventions next month, one option is to pay a lot of money to a media outlet. Lobbyists for the oil industry, for instance, are picking up the tab for leading Beltway publications to host energy policy discussions at the convention, including The Atlantic and Politico.

And for the right price, some political media outlets are even offering special interviews with editorial staffers and promotional coverage at the convention.

and

The Hill newspaper, which is sponsoring events at both the RNC and DNC, offers sponsors “a turnkey and custom experience,” including a “Thought-Leader Luncheon” moderated by The Hill’s editorial staff and the luncheon sponsor, who also gets to “curate a list of participants from politics, government, media and industry.”

Sponsors who pay $200,000 are promised convention interviews with The Hill’s editorial staff for “up to three named executives or organization representatives of your choice,” according to a brochure obtained by The Intercept. “These interviews are pieces of earned media,” the brochure says, “and will be hosted on a dedicated page on thehill.com and promoted across The Hill’s digital and social media channels.” Our inquiries to The Hill went unanswered.