Rangers' traditional support was largely from the Protestant community, and for decades the club had an unwritten rule whereby they would not knowingly sign a player of the Catholic faith.[17] The policy was decried by Graeme Souness when he became manager, and he brought ex-Celtic forward Mo Johnston to the club in a very public move away from the practice, which no longer continues.[18][19][20][6] Celtic's support was largely from those of Irish Roman Catholic backgrounds and while the club practiced no exclusion of Protestants and signed many of them to play for the team, there was a pro-Catholic mindset among some of the employees.[22] One effect is that Scottish flags are rarer than might be expected amongst both sets of supporters; Celtic fans are more likely to wave the Irish tricolour while Rangers fans tend to wave the Union Jack.[8]