MILWAUKEE (AP) — Therapists who try to change a minor’s sexual orientation will face fines in Milwaukee under a proposal approved Tuesday as a crowd of supporters of so-called conversion therapy yelled that the city’s council members who voted on it were evil.

Mayor Tom Barrett has until April 7 to sign the ordinance and he plans to do so, his office said.

The proposal received little opposition when it was initially heard this month, but dozens of people packed one side of the common council chambers Tuesday, some quietly praying while others occasionally yelled “evil!” A smaller crowd of LGBTQ supporters gathered on the other side of the chambers, waving a rainbow-colored flag.

“We know that the practice is harmful to a vulnerable population in our community,” said Alderman Cavalier Johnson, the measure’s sponsor, citing studies showing that youth who go through conversion therapy are more likely to experience depression, shame and social withdrawal.

Nine states and several cities have banned conversion therapy but there is no statewide prohibition in Wisconsin. Laws barring conversion therapy have withstood legal challenges in California and New Jersey.

Johnson acknowledged conversion therapy is “not extremely common” in Milwaukee but said it is available in the city’s suburbs, although he doesn’t know to what extent. The ban won’t apply in those jurisdictions, but Johnson said he wants to be proactive and hopes to start a trend.

Opponents are concerned the ban will infringe on religious-based counseling, but the prohibition applies only to practitioners who charge money. In those cases, therapists will be fined up to $1,000 for each violation.

Two of the 15 council members voted no on the ban, including Alderman Robert Donovan.

“I certainly respect the passion on both sides of this issue, but I will say this. The testimony that we received previously simply did not make a case in my mind that this problem even exists,” Donovan.

As the crowd filed out of the chambers after the vote, the atmosphere was still tense.

“God’s going to judge sinners!” 62-year-old Albert Herron, a Racine resident, yelled as he got on an elevator. “Corrupt, evil, wicked generation.”