"apparently the Masons had put his grandfather out of business."
It can happen merely by passing their business onto others who are Masons. One of my BiLs managed an engineering firm, and was involved with local college etc. Found that he would be asked to give quotes for specific jobs, but never got the eventual order.
After 4/5 such quotes, he'd leave future requests to the bottom of his in tray, because he would get business from elsewhere in the country, but these (local) firms, where he had met the bosses and had the wobbly handshake (but being Catholic, was not a Mason himself) all asked for quotes, but passed orders to others (whether Masons or not, he didn''t know) so it seemed like ultimate time waste - he'd spend his time calculating a quote and then not get the order anyway.
I can see how, (in situations where there was little "out of area" demand,) being shunned from getting work/ orders, could lead to closure. It's not just a bit of "back scratching", it can lead to those outside the brotherhood getting treated badly, whatever anyone else says.