The father of Terry Enright, the west Belfast community worker who died in a sectarian attack in January, appealed in Belfast yesterday for a Yes vote in the forthcoming referendum.
Speaking at the launch of a non-party campaign to support the Belfast Agreement, Mr Terry Enright Snr told a news conference: "On January 11th this year, my son was murdered by loyalist gunmen. He was a great guy, very strong with his own community and the young people who loved him and worked with him. At the weekend, two more young Catholics were killed.
"Now the people who killed my son and killed those people are the people who do not want to see progress, they do not want to see change in the North of Ireland which will improve all of our lives."
Mr Enright said the people who were spearheading the No campaign should be told: "Go away. We want to build a new life for our young people, for our children and grandchildren."
The director of the Yes campaign, Mr Quintin Oliver, who recently stepped down as director of the Northern Ireland Council for Voluntary Action, described the Belfast Agreement as "one of those great moments in all our lives".
The non-party Yes campaign had come about through informal discussions among like-minded individuals. Its supporters would not become divided over the detail of the agreement: "We accept the package as a whole and we commend it as a whole."
The campaign already had raised £55,000 and the ultimate target was "as much as we can get". The accounts of the campaign would be published.
"Some people will give anonymously, so our commitment is that we will not ask or take Government money or European money. It will be people's money, individuals and perhaps companies or perhaps other organisations. We will respect the anonymity of those donors who request it but we will also publish those who are happy for their names to be associated."
He said the funds raised so far had come in roughly equal shares: a third from Northern Ireland, a third from the rest of the United Kingdom and Ireland, and the remainder from further afield. A spokeswoman later denied a newspaper report that an unnamed millionaire was "bankrolling" the campaign. The campaign is described in its publicity material as "a loose coalition of individuals who came together to give support to those politicians working for agreement".
The Amalgamated Transport and General Workers' Union has called for a Yes vote in the referendum, north and south. "The trade union movement has campaigned for years for the establishment of democratic institutions in the North with cross-community support.