State campaign finance regulators have cracked down on a second political group aligned with Governor Charlie Baker, forcing the committee to divulge the donors behind the $1.168 million it spent supporting the governor’s 2016 ballot question campaigns.

On Tuesday, the Office of Campaign and Political Finance announced it had levied a $31,000 fine on Strong Economy for Growth (SEFG), charging the group violated finance laws in 2016 by not making public its contributors.

Also under the ruling, SEFG is barred from participating in Massachusetts politics in 2018.

SEFG, a Massachusetts-based nonprofit that files as a social welfare charity and can legally spend funds on political causes, helped finance Baker-backed campaigns to promote the expansion of charter schools and defeat recreational marijuana legalization.